DEPARTMENT OF THE ARMY TECHNICAL MANUAL TM 11-6675-200-10DEPARTMENT OF THE AIR FORCE TECHNICAL ORDER TO 49A1-1-101

OPERATOR’S MANUAL

THEODOLITESML-47-C THROUGH ML-47-RML-247 AND ML-247-A AND

DOUBLE CENTER THEODOLITEML-474/GM

D E P A R T M E N T S O F T H E A R M Y A N D T H E A I R F O R C E

SEPTEMBER 1958

Changes in force: C 4, C 6, and C 7

TM 11-6675-200-10C 7

CHANGE

No. 7

HEADQUARTERSDEPARTMENT OF THE ARMY

WASHINGTON , DC, 17 December 1973

Operator’s Manual

THEODOLITES ML-47-C THROUGHML-47-R, ML-247 AND ML-247-A,

AND DOUBLE CENTER THEODOLITEML-474/GM AND ML-474A/GM

TM 11–6675–200–10, 4 September 1958, ischanged as follows:

Page 5. Paragraph 2d is rescinded.Add paragraph 2.1 after paragraph 2.

2.1. Reporting of Equipment Publica-tion ImprovementsThe reporting of errors, omissions, and recom-mendations for improving this publication bythe individual user is encouraged. Reports

should be submitted on DA Form 2028 (Rec-ommended Changes to Publications), and for-warded direct to Commander, US Army Elec-tronics Command, ATTN: AMSEL-MA-SFort Monmouth, NJ 07703.

Page 6, paragraph 5. Change heading “Tableof Components” to read “Components and Di-mensions.

Add paragraph 5.1 after paragraph 5.

5.1. Items Comprising an Operable Equipment

FSN

6660-498-9773

TAGO 3319A

Nomenclature, part No., and mfr code

Theodolites, Double Center ML-474/GM and ML-474A/GM which includes:

NOTEThe part number is followed by the applic-able 5-digit Federal supply code for manu-facturers (FSCM ) identified in SB 708-42and used to identify manufacturer, distribu-tor, or Government agency, etc.

NOTEDry batteries shown are used with the equip-ment but are not considered part of the equip-ment. They will not be preshipped auto-matically but are to be requisitioned inquantitied necessary for the particular or-ganization in accordance with SB 11–6.

NOTENumber 1 in the usable on code columnrefers to components comprising an operable

Usableon Figure

code No.Q t y

F S N

6135-120-10206760-22%0178

6660-448-8296

6660-356-5228

4930-277-10446675-634-9312

5120-180-0571

5120-232-9506

5120-908-3103

5120-627-3500

1

11

1

2

1

1

1

1

Nomenclature, PartNo., and mfr code

ML-474/GM and number 2 refers to ML-474A/GM.

Battery: BA-30Cap, Protective: SM–B-531735, 80063Eyeshield: SM-B-531509, 80063

Hood, Lens: SM-C-531790,80063

Oiler, Hand: SM-B-88257,80063

Pin, Straight Headless: SC–B-88251, 80063Screwdriver: 5/32 in. wide tip, 1–1/2 in. long blade

fed spec, GGG-S-121, type 1, class 5, style 2,MSS5120-9,81349

Wrench, Spanner: 7012-104,65263

Wrench, Double Spanner: SM-B-531789,80063Wrench, SM-B-531791, 80063

Usableo n

code

1,2

1,21,2

1,2

1,21,2

1,2

122

Figure

No.

1,4

1

1

Page 32. Appendix III is superseded as follows:

APPENDIX IllBASIC ISSUE ITEMS LIST (BIIL) AND ITEMS

TROOP INSTALLED OR AUTHORIZED LIST (ITIAL)

Section 1. INTRODUCTION

A3-1. ScopeThis appendix lists only basic issue items re-quired by the crew/operator for installation,operation, and maintenance of Theodolites ML-474/GM and ML-474A/GM.

A3-2. GeneralThis Basic Issue Items and Items Troop In-stalled or Authorized List is divided into thefollowing sections:

a. Basic Issue Items List—Section II. A list,in alphabetical sequence, of items which arefurnished with, and which must be turned inwith the end item.

b. Items Troop Installed or Authorized List—Section III. Not applicable.

A3-3. Explanation of ColumnsThe following provides an explanation of col-umns found in the tabular listings:

a. Illustration. This column is divided asfollows :

(1) Figure Number. Indicates the figurenumber of the illustration in which the item isshown.

(2) Item Number. Not applicable.

b. Federal Stock Number, Indicates the Fed-eral stock number assigned to the item and willbe used for requisitioning purposes.

c. Part Number. Indicates the primary num-ber used by the manufacturer (individual, com-pany, firm, corporation, or Government activ-ity ), which controls the design and character-istics of the item by means of its engineeringdrawings, specifications standards, and inspec-tion requirements, to identify an item or rangeof items.

d. Federal Supply Code for Manufacturer(FSCM). The FSCM is a 5-digit numeric codeused to identify the manufacturer, distributor,or Government agency, etc., and is identified inSB 708-42.

e. Description. Indicates the Federal itemname and a minimum description required toidentify the item.

f. Unit of Measure (U/M). Indicates thestandard of basic quantity of the listed item asused in performing the actual maintenancefunction. This measure is expressed by a two-character alphabetical abbreviation, (e.g., ea,in., pr, etc.). When the unit of measure differs

Q t y

from the unit of issue, the lowest unit of issue A3-4. Special Informationthat will satisfy the required units of measure Usable on codes are included in Column 5. Un-will be requisitioned. coded items are applicable to all models. Identi-

g. Quantity furnished with Equipment fication of the usable on codes are as follows:(Basic Issue Items Only,). Indicates the quan-tity of the basic issue item furnished with the

Code Used on

1 ML-474/GMequipment,

(1)I l l u s t r a t ion

Fig. I t e m

No. No.

1

1

2 ML-474A/GM

Sec t ion I l . BASIC ISSUE ITEMS LIST

Federalstock

number

6660-911-2302

6660–498-9772

6675–356-5225

B y O r d e r o f t h e S e c r e t a r y o f

Of f i c i a l :

V E R N E L . B O W E R S

(3)

Partnumber

SM-C-531787

SM-C-531782

SC-B-88249

(4)

FSCM

80063

80063

80063

(5) ( 6 )

Desc r ip t ion U n i tU s a b l e o f

on code m e a s

B A S E B O A R D A S - 1 , 2 EASEMBLY, THEODO-LITE: (POSITIONSTHEODOLITE INCARRYING CASE)

C A S E , T H E O D O - 1 , 2 E ALITE CY-787A/U

HOOD, CANVAS 1,2 EA

(7)

Qtyf u r n

w i t h

e q u i p

1

1

1

t h e A r m y :

C R E I G H T O N W . A B R A M S

G e n e r a l , U n i t e d S t a t e s A r m y

C h i e f o f S t a f f

M a j o r G e n e r a l , U n i t e d S t a t e s A r m y

T h e A d j u t a n t G e n e r a l

Distribution:

Ac t i ve Army:

USASA (2 )C N G B ( 1 )ACSC (2 )Dir of Trans (1)COE (1 )TSG (1 )USAARENBD (1 )

USAMB (10 )AMC (1 )TRADOC (2 )ARADCOM (2 )ARADCOM Rgn (2)OS Maj Cored (4LOGCOMDS (3)MICOM (2)TECOM (2)USACC (4 )MDW (1 )Armies (2)

Corps (2)HISA (ECOM) (21 )Svc Colleges (1)USASESS (5)USAADS (2 )USAFAS (10 )USAARMS (10 )USAIS (10 )U S A E S ( 2 )USAINTS (3 )WRAMC (1 )USACDCEC (10 )ATS (1 )Instl (2) except

Fort Gordon (10)Fort Huachuca (10)Fort Carson (5)F t R i cha rdson (ECOM Of t ) ( 2 )WSMR (1)

3

(A) (B)

( 2 )

1

Army Dep (2) exceptLBAD (14)SAAD (30)TOAD (14)ATAD (10)

USA Dep (2)Sig Sec USA Dep (2)Sig Dep (2)Sig FLDMS (1)USAERDAA (1 )USAERDAW (1 )

MAAG (1)USARMIS (1)Units org under fol TOE:

(1 copy each)

NG: N o n e .

6-1006-1856-1866-2006-2016-3006-3026-5256–5266-5756–5776-7006-70177-100

11-9711-9811-11711-15811-500 (AA-AC)1717–1 0029-13429-1363737-10039-5157

For explanation of abbreviations used, see AR 310-50.

4

U S A R : N o n e

Changes in force: C 4 and C 6

TM 11-6675-200-1O*C 6

CHANGE HEADQUARTERSDEPARTMENT OF THE ARMY

No. 6 WASHINGTON, D. C., 21 September 1970

Operator’s Manual

THEODOLITES ML-47–C THROUGH ML–47–R, ML–247 AND ML–247–A,

AND DOUBLE CENTER THEODOLITE ML–474/GM AND ML–474A/GM

TM 11–6675–200–10, 4 September 1958, is changed as follows:

NOTEThe parenthetical reference to a previous change (example: page 1 of C 4) indicates that perti-nent material was published in that change.

Page 5, paragraph 1.1 (page 1 of C 4). Delete paragraph 1.1 and substitute:

1.1. Indexes of Equipment Publicationsa. DA Pam 310-4. Refer to the latest issue of

DA Pam 310-4 to determine whether there arenew editions, changes, or additional publicationspertaining to the equipment.

b. DA Pam 310-7. Refer to DA Pam 310-7 todetermine whether there are modification workorders (MWO’s) pertaining to the equipment.

Paragraph 2 (page 1 of C 4). Delete paragraph2 and substitute:

2. Forms and Recordsa. Reports of Maintenance and Unsatisfactory

Equipment. Use equipment forms and records inaccordance with instructions given in TM 38-750.

b. Report of Packaging and Handling Defi-ciencies. Fill out and forward DD Form 6 ( Reportof Packaging and Handling Deficiencies) as pre-scribed in AR 7000-58 (Army), NAVSUP PUB378 (Navy) AFR 71-4 (Air Force) and MCOP4030.29 ( Marine Corps).

c. Discrepancy in Shipment Report (DISREP)SF361 ). Fill out and forward Discrepancy in Ship-ment Report (DISREP) (SF361) as prescribed inAR 55-38 (Army) NAVSUP PUB 459 (Navy)/AFM 75-34 (Air Force) and MCO P461O.19(Marine Corps).

d. Reporting of Equipment Publication Improve-ments. The reporting of errors, omissions, andrecommendations for improving this publicationby the individual user is encouraged. Reportsshould be submitted on DA Form 2028 (Recom-mended Changes to Publications) and forwardeddirect to Commanding General, U.S. Army Elec-tronics Command, ATTN: AMSEL -ME-NMP-EM, Fort Monmouth, N. J., 07703.

Page 31, appendix I (page 3 of C 4). Add thefollowing reference. DA Pam 310-7 U.S. ArmyEquipment Index of Modification Work

Page 32, appendix III (page 1 of C 5).

Delete appendix III and substitute:

Orders

APPENDIX IllBASIC ISSUE ITEMS LISTSection 1. INTRODUCTION

A3-1, Scope A3–2. General

This appendix lists items which accompany the This Basic Issue Items List is divided into theML-474/GM and ML-474A GM or are required following sections:for installation operation, or operator’s main- a. Basic Issue Items-Section II. A list of itemstenance. which accompany the ML–474/GM and ML-

474A/GM and are required by the operator crew

*This change supersedes C 5, 2 November 1966.

for installation, operation, or maintenance.b. Maintenance and Operating Supplies-Sec-

tion III. Not Applicable.A3–3. Explanation of ColumnsThe following provides an explanation of columnsin the tabular list of Basic Issue Items, Section II.

a. Source, Maintenance, and Recoverability Codes(SMR), Column 1.

(1) Source code indicates the selection statusand source for the listed item. Source codes are—

Code Explaination

P —Repair parts which are stocked in or sup-plied from the GSA DSA, or Armysupply system, and authorized for useat indicated maintenance categories.

P2 – Repair parts which are procured andstocked for insurance purposes be-cause the combat or military essen-tiality of the end item dictates that aminimum quantity be available in thesupply system.

P9 —Assigned to items which are NSA designcontrolled: unique repair parts, specialtools, test, measuring and diagnosticequipment, which are stocked and sup-plied by the Army COMSEC logisticsystem, and which are not subject tothe provisions of AR 380--41.

P10 — Assigned to items which are NSA designcontrolled: special tools, test, measur-ing and diagnostic equipment for COM-SEC support, which are accountableunder the provisions of AR 380-41,and which are stocked and supplied bythe Army COMSEC logistic system.

M Repair parts which are not procured orstocked, but are to be manufacturedin indicated maintenance levels.

A --–Assemblies which are not procured orstocked as such, but are made up oftwo or more units. Such componentunits carry individual stock numbersand descriptions, are procured andstocked separately, and can be assem-bled to form the required assembly atindicated maintenance categories.

X – Parts and assemblies which are not pro-cured or stocked and the mortality ofwhich normally is below that of theapplicable end item or component. Thefailure of such part or assembly shouldresult in retirement of the end itemfrom the supply system.

Code Explanation

Xl —Repair parts which are not procured orstocked. The requirement for suchitems will be filled by use of the nexthigher assembly or component.

X2 —Repair parts which are not stocked. Theindicated maintenance category re-quiring such repair parts will attemptto obtain same through cannibaliza-tion. Where such repair parts are notobtainable through cannibalization, re-quirements w-ill be requisitioned withaccompanying justification, throughnormal supply channels.

C —Repair parts authorized for local pro-curement. Where such repair parts arenot obtainable from local procurement,requirements will be requisitionedthrough normal supply channels ac-companied by a supporting statementof nonavailability from local procure-ment.

G -- Major assemblies that are procured withPEMA funds for initial issue only asexchange assemblies at DSU and GSUlevel. These assemblies will not bestocked above DS and GS level or re-turned to depot supply level.

(2) Maintenance code indicates the lowestcategory of maintenance authorized to install thelisted item. The maintenance level codes are --

Code Explanation

C. . . . . . . . . Operator crewO. . . . . . . . . Organizational maintenance

(3) Recoverability code indicates whether un-serviceable items should be returned for recoveryor salvage. Items not coded are expendable. Re-coverability codes are–-

Code Explanation

R ---Repair parts and assemblies that areeconomically reapairble at DSU andGSU activities and are normally fur-nished by supply on an exchange basis.

s —Repair parts and assemblies which areeconomically repairable at DSU andGSU activities and which normally arefurnished by supply on an exchangebasis. When items are determined by aGSU to be uneconomically repairable,they will be evacuated to a depot forevaluation and analysis before finaldisposition.

2

code Explanation

T —High dollar value recoverable repair partswhich are subject to special handlingand are issued on an exchange basis.Such repair parts normally are repairedor overhauled at depot maintenanceactivities.

U —Repair parts specifically selected for sal-vage by reclamation units because ofprecious metal content, critical materi-als, or high dollar value reusablecasings or castings.

b. Federal Stock Number, Column 2. This columnindicates the Federal stock number assigned to theitem and will be used for requisitioning purposes.

c. Description), Column 3. This column indicatesthe Federal item name and any additional descrip-tion of the item required. A part number or otherreference number is followed by the applicablefive-digit Federal supply code for manufacturersin parentheses.

d. Unit of Measure (U/M), Column 4. A 2-character alphabetic abbreviation indicating theamount or quantity of the item upon which theallowances are based; e.g., ft, ea, pr, etc.

e. Quantity Incorporated in Unit, column 5.This column indicates the quantity of the itemused in the ML-474/GM and ML-474A/GM.

j. Quantity Furnished With Equipment, Column6. This column indicates the quantity of an itemfurnished with the equipment.

g. Illustration, Column 7. Not Applicable.

A3-4. Explanation of Columns in theTabular List of Maintenance andOperating Supplies — Section Ill

Not Applicable.

A3-5. Special Information

a. Identification of the usable on codes in thisappendix are-

Code U s e d O n 1. . . . . . . . . . . . . . . . . . . . . . ML-474/GM2 . . . . . . . . . . . . . . . . . . . . . . . . . ML-474A/GMb. Dry batteries shown are used with the equip-

ment but are not considered part of the equipment.They will not be preshipped automatically butare to be requisitioned in quantities necessary forthe particular organization, in accordance withSB 11-6.

A3–6. Federal Supply Codes forManufacturers

Code Manufacture

80063. . . . . . . .Army Electronics Command81349 . . . . . . . . Military Specifications

3

(1)SWCODE

(2)FEDERALSTOCKNIMBER

SECTION ,,. BASIC ISSUE ITEMS(3)

OESCR I PTIOM

,M 1 .,.:,, :.2 ,, ...

,0.rrl, :!.!- r,. .1, ,, (., ,,

1,.

1,:

., a

~,.

1,,

.,’

4,2

1,2

1,2

1,2

1

d

2

,LLuf,,~710Ns

(b)ITEM ‘NO.

OR R[FERFNCEDESIGNATION

By Order of the Secretary of the Army:

Official:KENNETH G. WICKHAM,Major General, United States Army,The Adjutant General.

Distribution:Active Army:

USASA (2)CNGB (1)ACSC-E (2)Dir of Trans (1)TSG (1)CofEngrs (1)CofSpts (1)USAARENBD (2)USACDCED (10)USACDC Agcy (1)USAMC (1)USAMICOM (4)USASTRATCOM (4)USATECOM (2)USCONARC (5)ARADCOM (5)ARADCOM Rgn (2)OS Maj Comd (4)LOGCOMD (2) except

1st LOGOMD (10)9th LOGCOMD (10)

MDW (1)Armies (2)Corps (2)1st Cav Div (5)Instl (2) except

Ft Carson (23)Ft Knox (12)Ft Gordon (10)Ft Huachuca (10)WSMR (5)

Svc Colleges (2)USASCS (10)USASESS (10)USAF.AS (10)USAARMS (10)USAIS (10)USAINTS (3)USAADS (2)USAES (2)USATC Armor (2)USATC Inf (2)USASTC (2)USATOPOCOM (1)Army Dep (2) except

SAAD (30)LBAD (14)

ARNG: NineUSAR: None.For explanation of abbreviations used, see AR 310-50.

W. C. WESTMORELAND,General, United States Army,Chief of Staff.

TOAD (14)ATAD (10)LEAD (7)NAAD (5)SVAD (5)CHAD (3)SHAD (3)

Gen Dep (2)Sig See, Gen Dep (5)Sig Dep (12)DPG (5)MAAG (1)USARMIS (1)WRAMC (1)USAERDAA (2)USAERDAW (13)USACRREL (2)Sig FLDMS (2)Units org under fol TOE (2 ea.):

6-1006-1856-1866-2006-2016-3006-3026-3856-3866-5256-5266-5756-5766-5776-7006-70177-10011-9711-9811-11711-1.5811-500(AA-AC)1717-1003737-10039-5157

U.S. GOVERNMENT PRINTING OFFICE 1970-431-122/307✩

Changes in force: C 4

CHANGE

No. 4

Operator’s Manual

TM 11-6675-200-10C 4

HEADQUARTERSDEPARTMENT OF THE ARMY

WASHINGTON . D C., 27 January1966

THEODOLITES ML-47-C THROUGH ML-47-R, ML-247, AND ML-247-A,

AND DOUBLE CENTER THEODOLITE ML-474/GM, AND ML-474A/GM

TM 11–6675–200–10, 4 September 1958, is changed as follows:

The title is changed as shown above.

Page 5, paragraph lc, last line as changedby C 3, 13 Aug 63). Delete TM 11–6675-200and substitute TM 11–6675-200–20.

Add paragraph 1.1 after paragraph 1 (asadded by C 3, 13 Aug 63).

1.1 Index of Publications

Refer to the latest issue of DA Pam 310-4to determine whether there are new editions,changes, or additional publications pertainingto this equipment. DA Pam 310-4 is an indexof current technical manuals, technical bulle-tins, supply bulletins, lubrication orders, andmodification work orders that are availablethrough publications supply channels. The in-dex lists the individual parts (–10, –20, –35P,etc. ) and the latest changes to and revisions ofeach equipment publication.

Delete paragraph 2 (asAug 63) and substitute:

2. Forms and Records

changed by C 3, 13

a. Reports of Maintenance and Unrsatisfac-tory Equipment. Use equipment forms arid rec-ords in accordance with instructions in TM38-750.

b. Report of Damaged or Improper Shipment.Fill out and forward DD Form 6 (Report ofDamaged or Improper Shipment) as prescribed

in AR 700–58 (Army), NAVSANDA Publi-cation 378 (Navy), and AFR 71-4 (AirForce).

c. Report of Errors, Omissions, and Recom-mendations. The direct reporting of errors,omissions, and recommendations for improv-ing this manual by the individual user, isauthorized and encouraged. DA Form 2028(Recommended Changes to DA Publications)will be used for reporting these improvements:This form will be completed using pencil, pen,or typewriter and forwarded direct to Com-manding General, U. S. Army ElectronicsCommand, ATTN: AMSEL-MR-(NMP)-MA,Fort Monmouth, N. J. 07703.

Page 26, chapter 4 (as changed by C 3, 13Aug 63). Delete the heading and substitute:

MAINTENANCE INSTRUCTIONS.

Delete paragraphs 32 through 34 and sub-stitute:

32. Scope of Operator’s Maintenance

The maintenance duties assigned to the op-erator of the theodolite set are listed below,together with a reference to the paragraphscovering the specific maintenance functions.The duties assigned do not require tools otherthan those issued with the equipment.

a. Daily preventive maintenance checks andservices ( para 34.2).

* This change supersedes C 2, 4 November 1959, and C3, 13 August 1963.

TAGO 6317A

1

b. Weekly preventive maintenance checksand services ( para 34.3).

c. Cleaning (para 34.4).d. Lubrication ( para 35).e. Equipment performance checklist (para

36).f. Replacement of batteries and lamps (para

37).

33. Tools and Materials Requiredfor Maintenance

a. Tools. Only the tools supplied with theequipment are required.

b. Materials.(1)(2)(3)(4)(5)

(6)

(7)

Camel’s-hair brush.Lint free cloth.Lens tissue.Lens cleaner.Lubricating oil, general purpose, pre-servative ( PL special), 4 oz can/spout.Lubricating oil, watch (OCW), 5 ccbottle/fine dropper.Cleaning compound, liquid form (Fed-eral stock No. 7930–395–9542).

34. Preventive Maintenance

Preventive maintenance is the systematiccare, servicing, and inspection of equipment toprevent occurrence of trouble, to reduce down-time, and to assure that the equipment isserviceable.

a. Systematic Care. The procedures given inparagraphs 34.2 through 34.4 cover systematiccare essential to proper upkeep and operationof the equipment. The cleaning operations(para 34.4) should be performed once a day.

If the equipment is not used daily, however,the cleaning operations must be performed be-fore operation after any extended shutdown,or once a week while the equipment is keptin standby condition. The other items must bechecked before the equipment is placed in op-eration after a shutdown, during operation, orafter it is turned off, as specified in the appli-cable paragraph.

b. Preventive Maintenance Checks and Serv-ices. The preventive maintenance checks andservices charts (paras 34.2 and 34.3) outlinefunctions to be performed at specific intervals.These checks and services are to maintainArmy electronic equipment in a combat serv-iceable condition; that is, in good general (phy-sical) condition and in good operating condi-tion. To assist operators in maintaining combatserviceability, the charts indicate what tocheck, how to check, and what the normal con-ditions are; the References column lists the il-lustrations, paragraphs, or manuals that containdetailed repair or replacement procedures. Ifthe defect cannot be remedied by the operator,higher level maintenance or repair is required.Records and reports of these checks and serv-ices must be made in accordance with therequirements set forth in TM 38-750.

Add paragraphs 34.1 through 34.4 after-paragraph 34.

34.1 Preventive Maintenance Checks andServices Periods

Preventive maintenance checks and servicesof the theodolite set are required on a dailyand weekly basis. Paragraph 34.2 specifieschecks and services that must be performeddaily and paragraph 34.3 specifies checks andservices that must be accomplished on a weeklybasis.

34.2 Daily Preventive Maintenance Checks and Services Chart

SequenceNo.

Item Procedure Reference

1 Exterior surfaces -------------- Clean the carrying case, theodolite, and Para 34.4.baseplate (fig. 1).

2 Moving parts ----------------- Inspect all moving parts for smoothoperation.

3 Batteries -------------------------- Inspect batteries for leakage or bulging . Replace batteries (para 37a).4 Lamps -------------------------- Check for broken, missing, or defective Replace lamps (para 37 b).

lamps.

2 AGO 6817A

34.3 Weekly Preventive Maintenance Checks and Services Chart

Sequence

1234

56

Item

Exterior surfaces -----------Canvas cover ------------Carrying case ----------------Hardware -- - - - - - - - - - - - - - -

Lubrication -------------------Operational check -----------

Procedure

Inspect exposed metal surfaces for rust and corrosion.Inspect cover (fig. 1) for fungus, fraying, and tears.Inspect handle, latches, and hinges for looseness.Check for worn, loose, or missing parts and screws;

tighten all loose screws except the adjustmentscrews.

Lubricate the equipment (para 35 and fig. 4).Perform equipment performance checklist (para 36);

be alert for any unusual operating conditions.

Reference

Para 34.4.

Para 36.

34.4 Cleaning

a. Carefully remove all dust, dirt, and for-eign matter from the exposed optical surfacesof the lenses; use a camel’s-hair brush, or agentle blast of moisture free compressed air.

Caution: Do not use lens tissue that containssilicone to clean optical surfaces. Any residuedeposit that would be left on the optical sur-faces by this kind of lens tissue could affectthe performance of the optical parts.

b. Slightly dampen a wad of lens tissue withlens cleaner.

c. Gently wipe the exposed optical surfaces ofthe theodolite set with the moistened lens tis-sue; use a circular motion starting from theedge of the glass and work toward the center.

d. Dry the cleaned optical surfaces with afresh lens tissue; use the same circular motiondescribed in c above.

e. Clean all exposed metal parts of the theodo-lite set with a dry, lint free cloth.

f. Use a camel’s-hair brush to remove dustand foreign matter from hard-to-reach partson the equipment.

Warning: Cleaning compound is flammableand its fumes toxic. Provide adequate ventila-tion; do not use near a flame.

Caution: Do not allow cleaning compound tocome in contact with optical or lubricated sur-faces. Use cleaning compound sparingly.

g. If foreign matter cannot be removed fromthe mechanical parts of the equipment by nor-

AGO 6317A

mal wiping, use a clean, lint free cloth mois-tened with cleaning compound to remove stub-born grime. Wipe the cleaned parts dry witha clean, lint free cloth immediately aftercleaning.

Page 27, paragraph 36 (as changed by C 3,13 Aug 63), chart, “Corrective measures” col-umn. Make the following changes:

Line 4, change (para 34f) to (para 34.4).

Line 10, change (para 34f) to (para 34.4).

Page 31, appendix I (as changed by C 3, 13Aug 63). Add the following references:DA Pam 310-4 Index of Technical Manu-

als, Technical Bulletins,Supply Manuals (Types7, 8, and 9), Supply Bul-letins, Lubrication Or-ders, and ModificationWork Orders

TB SIG 364 F i e l d I n s t r u c t i o n s f o rPainting and PreservingE l e c t r o n i c s C o m -mand Equipment.

TM 38-750 Army Equipment RecordProcedures.

Delete TM 11–2426 Meteorological StationAN/TMQ4 and substitute:TM 11-6660-218-15 Operator’s Organization-

al, Field, and DepotMaintenance Manualfor Meteorological Sta-t ion AN/TMQ4

3

No.

Page 32. Delete appendix III (as changed by C 2,4 Nov 59) and substitute:

APPENDIX IllBASIC ISSUE ITEMS

Section 1. INTRODUCTION

1. General

a. This appendix lists items supplied forinitial operation and for running spares. Thelist includes tools, parts, and material issued aspart of the major end item. The list includesall items authorized for basic operator mainte-nance of the equipment. End items of equip-ment are issued on the basis of allowances pre-scribed in equipment authorization tables andother documents that are a basis for requisi-tioning.

b. Columns areas follows:(1)

(2)

(3)

(4)

Federal stock number. This columnlists the n-digit Federal stocknumber.Designation by model. The dagger(t) indicates the equipment and/ormodel in which the part is used.Description. Nomenclature or thestandard item name and brief identi-fying data for each item are listed inthis column. When requisitioning,enter the nomenclature and descrip-tion.Unit of issue. The unit of issue is eachunless otherwise indicated and is thesupply term by which the individualitem is counted for procurement, stor-age, requisitioning, allowances, andissue purposes.

(5)

(6)

(7)

Expendability. Nonexpendable itemsare indicated by NX. Expendableitems are not annotated.Quantity authorized. Under “ItemsComprising an Operable Equipment”,the column lists the quantity of itemssupplied for the initial operation ofthe equipment. Under “Running SpareItems” the quantities listed are thoseissued initially with the equipment asspare parts. The quantities are au-thorized to be kept on hand by theoperator for maintenance of theequipment.Illustration. The “Item No.” columnlists the reference designations thatappear on the part in the equipment.These same designations are also usedon any illustrations of the equipment. –The numbers in the “Figure No.”column refer to the illustrations wherethe part is shown.

2. Batteries

Dry batteries shown are used with theequipment but are not considered part of theequipment. They will not be preshipped auto-matically but are to be requisitioned in quan-tities necessary for the particular organization,in accordance with SB 11–6.

4 AGO 6317A —

5

-SlmCOOE

:.R

2

c

c

c

c

c

c

( 2 )FEDERALSTOCKtIWBER

515$J-498-?77?

$0-?ll-23~

35-12O-1O2I

6 0 - 2 2 2 - 0 1 7

6 0 - 4 % - 9 7 7

7 5 - 3 5 6 - 5 2 2

6 0 - 4 4 8 - 8 2 9

6 0 - 3 5 6 - 5 2 2

!+0-797-265

I 3 W 2 7 7 - 1 0 4

, 7 5 - 6 3 4 - 9 3 1

. 2 0 - 1 8 0 - 0 5 7

. 2 0 - 2 3 2 - 9 5 (

1 2 3 - 9 3 8 - 3 1 (

S E C T I O N 11.BASIC IWE ITEMS

( 3 )

OESCRIPTIOH

USABLE ON

teference number h Mfr COde COOE

‘TIC30DOLI ‘ES, DOUBLE CENTSR ML-474/Q4 AND ML- k7kA/GM :(l’his ,tem is nonexpendable)

m 1 1 - 6 6 7 5 - 2 s 0 - 1 0

For terhnical manuals the quantity indicates the maxLmumnumber of copies authorized for packing (or issue) with theequipment. Where a number of these equipments are concentratedin a small area, the quantity on hmi w be reduced to theminimum acttial requirements as determined by the c-diU?officer of the unit.

BASEBOARD ASSEt.!BLY, lTIEODOLITE: (Positions theodolitein cexrying case) SM-C-531787 (8~3)

EATTERY BA-30

C A P , FFQ’ITCTIVS: sM-B-531735 ( 8 0 0 6 3 )

cASE , THEODOLI TE CY-787A/U :SM-C-531782 (8s063 ) (This item is nonexpendable ~

H03D, C A N V A S : SC- B-882~9 (8N63)

EYESHIELD: SM-B-531509 (8ti3)

HcOD, LENS: SM-C-531793 (80@3)

f#i.fP: 2.5V; 0.3 ~P; SM-C-531784-4 ( 8 0 0 6 3 )

“ A C C E S S O R I E S , TOOIS, AND ~T EQ~~NT”

OILER, HAND: SM-B-88257 (80363)(TIIiS item is none~endable )

PIN, STRAIGHT H2ADLESS:SC-B-88251 (80063)

SCWDRIVER: 5/32 in wide tie; 1 1/2 in 10W bl~e;fed spec ~-s-121; type 1; class 5, style 2; MSS5120-9(81349) (This item is nonexpendable)

I wRENCH, SPANNXR: 7012-104 (65263)

wRRNCH, D O U B L E SPANtJ?W SM-B-531789 (aoo63)(’fhis item is nonexpendable)

L20-627-3500 W R E N C H: SM-B-531791 ( 8 0 0 6 3 )

1,2

1,2

1,2

1,2

1,2

1,2

1,2

1,2

1,2

1,2

1,2

1

2

2

TYicnI T

L

L

1

1

1

1

3

1

2

1

1

1

1

—

i7‘1II

L

L

1

1

1

1

,.,ILLUSTRATIONS

( b )I TEN MO.

017 REFERENcEOESIGNATIW

By Order of the Secretary of the Army:

Official:

J . C . L A M B E R T ,

Major General, United, States A Army,The Adjutant General 1.

Distribution:

Active Army:USASA (2)CNGB (1)CC-E (7)Dir of Trans (1)CofEngrs (1)TSG (I)Cofspts ( 1 )USACDCEA (1)USACDCCLBRA (1)USACDCCEA (1)USACDCOA (1)USACDCQMA (1)USACDCTA (1)USACDCADA (1)USACDCARMA (1)USACDCAVNA (1)USACDCARTYA (1)USACDCSWA (1)USACDCCEA:

Ft Huachuca ( 1 )USACDCEC (10)USAMC (5)USCONARC (5)ARADCOM (5)ARADCOM Rgn (2)0S Maj Cored (4)USAREUR (5)LOGCOMD (2)USAMICOM (4)

USASMC (2)USASCC (4)MDW (1)Armies (2)Corps (2)USAC (3)llth Air Aslt Div (3)Svc Colleges (2)Br Svc Sch (2) except

USAAMS (30)USACMLCS (5)USASCS (40)

USASTC (2)USATC AD (2)USATC Armor (2)USATC Engr (2)USATC Inf (2)WRAMC (1)Army Pic Cen (2)APG (5)

H A R O L D K . J O H N S O N ,G e n e r a l , U n i t e d S t a t e s A r m y ,

Chie f o f Staf f .

DPG (5)YPG (5)Sig Fld Maint Shops (2)AMS (1)USAERDAA (2)USAERDAW (13)GENDEP (2)Sig Sec GENDEP (5)Sig Dep (12)A Dep (2) except

SAAD (30)TOAD (14)FTWOAD (10)LEAD (7)SHAD (3)NAAD (5)SVAD (5)CHAD (3)ATAD (10)

Instl (2) exceptFt Monmouth (70)Ft Hancock (4)Ft Gordon (10)Ft Huachuca ( 10)Ft Carson (25)Ft Knox (12)

WSMR (5)CRREL (2)USABIOLABS (5)Units org under fol TOE:

(2 copies each)6- l006-1016-1856-1866-2006–2016-3006-3026-3856-3866-5256-5266-5656-5756-5766-5776-7006-701

AGO 6317A 7

8

6-7156-71677-10011–5711-9711-9811-11711–12711–15511-15711–15811-500 (AA-AC)

NG: None.

USAR: None

11-58711-59211-5971717-1003737-10039-5139-6544-164757

U.S. Government Printing Office: 1966—200-508/6317A

AGO 6317A

For explanation of abbreviations used, see AR 320-50.

✩

*TM 11-6675-200-10/TO 49A1-1-101

T ECHNICAL M A N U A L DEPARTMENTS OF THE ARMYNo. 11–6675–200–10 AND THE AIR FORCET ECHNICAL O R D E R

No. 49A1-1–101 W ASHINGTON 25, D. C., 4 September 1958}

THEODOLITES ML-47-C THROUGH ML-47-RML-247 AND ML-247-A

ANDDOUBLE CENTER THEODOLITE ML-474/GM

CHAPTER 1 .Section I.

II.

CHAPTER 2.

CHAPTER 3.Section I.

II.

III.

ParagraphINTRODUCTIONGeneral.S c o p e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..... . . . . . . . . . . . . . . . . . . . . . . . . . . . ..1Forms and records . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Description and data.Purpose and use . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Technical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4Table of components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5Common names .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . .7Additional equipment required .. . . . . . . . .. . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Differences in models . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

SERVICE UPON RECEIPT OF EQUIPMENTUnpacking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10Checking unpacked euipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

OPERATIONControls, scales and indicators.Orienting controls and indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12Operating controls and scales . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Preliminary procedures.Erecting tripod . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14Setting up theodolite. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15Leveling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16Focusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17Orienting by compass . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18Orienting by sun . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19Orienting by Polaris . . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Orienting by equal angles . . .. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21Orienting by datum lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22Orienting by transference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23Establishing datum lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24Presetting controls .. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .25

Operation under usual conditions.Tracking object . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .26Reading scales . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27Stopping procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .28

Page

55

5566666

88

1010

111112131313141922222323

232424

● This manual supersedes so much of TM 11–423, 7 October 1944, including C 1, 4 January 1954, C 2, 15 May1954, and C 3, 5 April 1956, as pertains to operating instructions.

1

ParagraphSection IV. Operation under unusual conditions.

Operation in arctic climates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29Operation in tropical climates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30Operation in desert climates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

CHAPTER 4. PREVENTIVE MAINTENANCE.Scope of operator’s maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32Tools and materials required . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33Preventive maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34Lubrication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35Equipment performance check list... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .36Replacement of batteries and lamps . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

CHAPTER 5. SHIPMENT AND LIMITED STORAGE AND DEMOLITION TO PREVENTENEMY USE

Section I. Shipment and limited storage.Disassembly of equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .38Repacking for shipment or limited storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

II. Demolition of material to prevent enemy use.Authority for demolition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40Methods of destruction . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41

APPENDIX I. REFERENCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Page

252525

262626262629

3030

3030

31

32

TAGO 863A 3

II. GLOSSARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....... ...

4

Figure 1. Double Center Theodolite ML-474/GM

TAGO 863A

CHAPTER 1

INTRODUCTION

1. Scope(fig. 1)

a. This manual describes Theodolites ML-47– (*) and ML-247-(*) and Double CenterTheodolite ML-474/GM and covers their in-stallation, operation, and operator’s mainte-nance. It includes operation under usual andunusual conditions, cleaning and inspection ofthe equipment, and replacement of parts avail-able to first echelon maintenance.

b. Official nomenclature followed by (*) isused to indicate all models of an item equipmentcovered in this manual. Thus, Theodolites ML-47-(*) represents Theodolites ML-47-C,through ML-47-R. Theodolite ML-247– (*)represents Theodolites ML-247 and ML-247-A.

c. The Maintenance Allocation Charts arepublished in TM 11–6675–200.

2. Forms and Recordsa. Unsatisfactory Equipment Reports.

(1) Fill out and forward DA Form 468(Unsatisfactory Equipment Report)to the Commanding Officer, U. S.

(2)

Army Equipment Support Agency,Fort Monmouth, N. J., as prescribedin AR 700–38.Fill out and forward AF TO Form 29(Unsatisfactory Report) to the Com-mander, Air Materiel Command,Wright-Patterson Air Force Base,Ohio, as prescribed in AF TO 00-35D-54.

b. Report of Damaged or improper Ship-ment. Fill out and forward DD Form 6 (Re-port of Damaged or Improper Shipment) asprescribed in AR 700–58 (Army) and AFR71–4 (Air Force).

c. Parts List Form. Forward DA Form2028 (Recommended Changes to DA TechnicalManual Parts Lists or Supply Manuals 7, 8,and 9) directly to the Commanding Officer,U. S. Army Signal Equipment Support Agency,Fort Monmouth, N. J.,

d. Comments on Manual. Forward all othercomments on this publication directly to theCommanding Officer, U. S. Army Signal Publi-cations Agency, Fort Monmouth, N. J.

Section Il. DESCRIPTION AND DATA

3. Purpose and UseThe theodolite set (fig. 1) provides a weather

station operator with azimuth and elevationmeasurements of an object in space. It is usedprimarily to follow and measure the movementof pilot balloons.

4. Technical CharacteristicsTracking telescope:

Magnification . . . . . . . . . . . . . . .19 to 24 power.Angle of view . . . . . . . . . . . . . . .2.1° to 1.7°Optical system . . . . . . . . . . . . . Right-angle, using prism.

1

Finder telescope:Magnification . . . . . . . . . . . . . . .3.75 to 5 power.1

Angle of view. . . . . . . . . . . . . .4.3° to 3.2°.Optical system. . . . . . . . . . . .. Right-angle, using mirror.

Azimuth scale:Range . . . . . . . . . . . . . . . . . . . . . . . . . . ..360°.Calibration . . . . . . . . . . . . . . . . . . . . .1O.

Elevation scale:Range. . . . . . . . . . . . . . . . . . . . . . . . . ...240”.Calibration . . . . . . . . . . . . . . . . . . . .1O.

Power requirements., . . . . . . . . . 3 volts dc (two 1½-volt bat-teries).

1 The magnification of the tracking telescope and the finder telescope is a fixed characteristic.

TAGO 863A 5

Section I. GENERAL

5. Table of Components the carrying case. Two wooden blocks, mountedThe components of Double-Center Theodolite on the base plate, hold tools, spare lamps, and

ML–474/GM and Theodolites ML-247–(*) and the lens hood.ML-47– (*) are listed below. c. The carrying case is made of wood and has

DimensionsQuantity Item

1 Theodolite, including:

11 set

11

2 lamp shades.3 Lamps LM–19.1 lens hood.1 lens cap.

Base plate.Tools, including:

1 spanner wrench.1 hand oiler.1 screwdriver TL-22.1 adjusting pin.

CoverCarrying case.

3 Lamps LM-19(running spares).

6 . C o m m o n N a m e s

Nomanclature

Theodolite MP47–(*), TheodoliteML-247-(*), and Double CenterTheodolite, ML-474/GM.

Tripod ML-78-(*) or SurveyingTripod Mount 1309/GM.

Compass ML-197 . . . . . . . . . . . . . . . . . . . . . . . .Telescope ML-146 . . . . . . . . . . . . . . . . . . . . . . . . . . . .Main theodolite telescope . . . . . . . . . . . . . . . . .

7. Description

Common name

Theodolite set

Tripod

CompassFinder telescopeTracking telescope

The theodolite set (fig. 1) consists principally

of the theodolite, base plate, and carrying case.

a. The theodol i te ( f ig . 2 ) cons ists o f a dual

te lescope , an az imuth and e levat ion mounting ,a n d a l e v e l i n g a s s e m b l y . T h e o p e r a t i n g c o n -

trols are located on the telescope, the azimuthm o u n t i n g , a n d t h e e l e v a t i o n m o u n t i n g . T h e

orientation controls are located on the levelingassembly . The battery compartment is located

on the azimuth and elevation mounting.

b. The base p late secures the theodol i te in

6

15¼ x 12¾ x 11

1 1/16 x ½

231/32 X 211/16 X 2 3/3211 X 7 21/32

13/16 X 19/32 X 5/322X3/81½ X 4¼ X 3/16 X 1/322½ x .09721¾ X 17½ X 3/1617 x 14¾ x 11¾

Unitweight

19 lb10 oz

2 lb

9 Oz19 lb

9 Oz

a hinged, door and an interior rack for holdingspare Batteries BA–30.

8. Additional Equipment Required

a. Surveying Tripod Mount MT–1309/GM orTripod ML-78– (*) is used to support the theod-olite during operation.

b. Timing and Telephone Set ML-11O (TM11–334) is required to furnish timing signalsto the theodolite operator and intercom betweenthe theodolite operator and the recorder.

c. Plumb-bob, Federal stock No. 5210-238-3298 enables the theodolite to be exactly posi-tioned over an observation point.

d. Four Batteries BA–30 (two for runningspares ) are required for night operation.

9. Differences in Models

All models of the theodolite are similar insize, shape, and general appearance. The dif-ferences among the models discussed in thismanual are given in the chart below.

TAGO 863A

(in.)

ML-47-(*) orItem ML-247-(*) ML-474/GM

Cross hair lampswitch

Brightnesscontrol.

Turns cross hair Not usedlamp on and off.

Controls Brightness Turns cross hairof Cross hair lamp on and offlamp. and also con-

trols its bright-ness.

Figure 2. Theodolite, view of telescope, azimuth and elevation mounting, and leveling assembly.

7

CHAPTER 2

SERVICE UPON RECEIPT OF EQUIPMENT

10. Unpackinga. Packaging Data. When packaged for ship-

ment, the theodolite set is placed in a woodenbox which is 20 inches by 16¼ inches by 13¼inches. The volume is 2.5 cubic feet and thetotal weight is 85 pounds.

b. Removing Contents.(1)

(2)(3)

(4)

Place the wooden packing case nearthe operating position.Cut and fold back the metal straps.Remove the nails with a nail puller.Remove the wooden cover from thewooden packing case and remove thetechnical manual. Do not attempt topry off the wooden cover; the equip-ment may become damaged.Slit the pressure-sensitive tape andopen the water-resistant fiberboardbox.

(5) Remove the fiberboard pads and thetheodolite set.

11. Checking Unpacked Equipment

a. Inspect the equipment for any loss or dam-age that might have occurred during shipment.If the equipment has been damaged or is in-complete, refer to paragraph 2.

b. Check the equipment against the packinglist. When no packing list accompanies theequipment, the table of components (par. 5)and/or the packaging data (par. 10a) may beused as a general check to indicate the equip-ment which probably has been packed.

c. If the equipment has been used or recon-ditioned, check to see whether it has beenchanged by a modification work order (MWO).If modified, the MWO number will appear nearthe nomenclature plate.

TAGO 863A8

9T A G O 8 6 3 A

CHAPTER 3

OPERATION

Section 1. CONTROLS, SCALES, AND INDICATORS

12. Orienting Controls and Indicators(fig. 4)

The chart below lists the controls and indi-cators used when orienting the theodolite.

(Control or scale

Azimuth scale.

C e n t r o l

Azimuth calibrationclamp.

Azimuth calibrationadjustment.

Leveling screws.Compass (fig. 2).

Levels (fig. 2).

F u n c t i o n

—

Locks azimuth and elevationmounting to centering shaft.

Provides fine azimuth adjust-ment.

Adjust leveling of theodolite.Indicates direction of magnetic

north.Indicate when theodolite is level.

13. Operating Controls and Scales(fig. 4)

The chart below lists the controls used whenthe theodolite is operated.

Contro l o r sca le

Short sights.Extension sights.

Finder-trackinglever.

Focusing knob.Focusing eyepiece.Elevation scale.

Elevation trackingcontrol.

F u n c t i o n

For rapid location of object.For rapid location of near-vertical

object.Rear position (away from focusing

eyepiece) selects finder telescope.Forward position (towards focus-

ing eyepiece) selects trackingtelescope.

Focuses tracking telescope.Focuses cross hairs on telescope.Indicates elevation of object in

degrees. ‘Adjusts elevation scale and tele-

scope 1° per turn and indicatesreadings in .1O.

Azimuth trackingControl.

Scale lamp switch(SPDT toggleswitch).

Cross hair lampswitch(ML-47-(*) orML-247-(*))(not shown)( SPDT toggleswitch)

Brightness control(ML-47-(*) orML-247-(*))

Brightness control(ML-474/GM)

F u n c t i o n

indicates azimuth of object indegrees.

Adjusts azimuth scale and telescope 1° per turn and indicatesreadings in .1º.

P o s i t i o n F u n c t i o n

OFF Turns scale lampsoff.

ON Lights scale(momentary lamps.action )(ML-47-(*)and ML-247–(*)) .

ON Lights scale(normal lamps.action ).

P o s i t i o n F u n c t i o n

OFF Turns cross hairlamp off.

ON Lights cross hair(momentary lamp.action )

ON Lights cross hair(normal lamp.action)

Varies dc voltage to cross hairlamp.

Variable resistor:

Position F u n c t i o n

Extreme Turns cross hairclockwise lamp off.

Other than Lights and variesextreme brightness ofclockwise cross hair lamp.position

10 TAGO 863A

Figure 4. Theodolite, view of controls, scales, and indicators.

Section II, PRELIMINARY PROCEDURES

14. Erecting Tripod(fig. 5)

a. Unfasten the belt that holds the legs to-gether.

b. Loosen the thumbscrews.

c. Spread the legs of the tripod until themount is approximately 9 inches below eyelevel, If the surface is smooth and hard,spread the legs until the chain is tight to pre-vent slipping,

d. Tighten the thumbscrews.

e. If the tripod is to be used on the ground,

TAGO 863A

dig the cleats of the legs into the ground so thatthe tripod stands firm.

f. Unscrew and remove the protector cap byturning it counterclockwise.

15. Setting Up Theodolite

To remove the theodolite from the carryingcase and secure it to the tripod, proceed asfollows:

a. Disengage the azimuth tracking control(fig. 4) by pulling it away from the azimuthscale.

b. Pull the theodolite (fig, 1) and base plate.

11

Figure 5. Tripod.

from the carrying case by pulling on the baseplate.

c. Place the theodolite and base plate on afirm, level surface.

d. Be sure that the azimuth calibration clamp(fig. 4) is tight.

e. Unscrew the theodolite from the base plate(fig. 1) by turning the leveling plate (fig. 4)counterclockwise.

f. Screw the theodolite to the tripod mount(fig. 5) by turning the leveling plate clockwise.

g, Remove the lens cap (fig. 4) from thetracking telescope.

h. Place the lens hood (fig. 1) on the track-ing telescope.

12

i. Place the lens cap (fig. 4) on the base plateblock that held the lens hood (fig. 1).

j. If night operation is intended, install thebatteries as follows:

(1) Loosen the catch on the top of thebattery compartment.

(2) Open the battery compartment.(3) Install the batteries, Be sure that the

base of each battery contacts thesprings.

(4) Close the battery compartment andsecure the catch.

16. Levelinga. Position the tracking telescope (fig. 4)

vertically.b. Loosen the leveling screws and position

the centering’ shaft approximately in the centerof the leveling plate.

c. Rotate the azimuth and elevation mount-ing (fig. 2) until the long axis of each level isparallel to a diametrically opposite pair of level-ing screws (fig. 6).

d. Check to see that the azimuth calibrationclamp is tight.

e. Engage the azimuth tracking control.f. Adjust a pair of diagonally opposite level-

ing screws (fig. 6) until the bubble of the level(fig, 2) that has its long axis parallel to thispair is centered.

Place the thumbs on the lef t cl ingscrews as shown in figure 6.Move the thumbs either toward oraway from each other simultaneously.The bubble will move in the directionof the left thumb.The screw pressure on the levelingplate should always be sufficient toprevent the upper portion from shift-ing or rocking.

g. Repeat the procedures given in f above forthe other pair of leveling screws and the otherlevel.

h. Repeat the procedures given in both f andg above for fine adjustment to exactly centerthe level bubbles.

i. Disengage the azimuth tracking controland rotate the azimuth and elevation mountinguntil the levels are 180° from their originalposition. The bubbles should remain centered.

TAGO 863A

(1)

(2)

(3)

(4)

j. If the bubbles do not remain centered inthe levels, repeat the procedures given in fthrough i above until they do. If leveling can-not be accomplished, the theodolite requiresadjustment by higher echelon maintenance.

17. Focusing(fig. 4)

a. Cross Hairs. The cross hairs should befocused to adjust the focusing eyepiece to theoperator’s eye, The finder-tracking lever maybe in either position for this operation.

(1) Look through the focusing eyepieceand direct the telescope toward asource of uniform light.

(2) Rotate the focusing eyepiece until thecross hairs arc sharp and distinct.

b. Telescope.(1) Position the finder-tracking lever

toward the focusing eyepiece.(2) Look through the focusing eyepiece

and point the telescope at an objectat least 100 feet away.

(3) Adjust the focusing knob until theobject is sharp and distinct.

18. Orienting by Compass(figs. 2 and 4)

a. Disengage the azimuth tracking control(fig. 4) by pulling it away from the azimuth.and elevation mounting.

b. Determine the deviation between magneticnorth and true north for the theodolite location.

c. If the deviation is minus, subtract it from360. If the deviation is plus, add it to zero.

TAGO 863A

d. Rotate the azimuth and elevation mount-ing (fig. 2) until the fiducial marker of theazimuth scale lines up with the number deter-mined in c above.

e, Engage the azimuth tracking control (fig.4) by pushing it toward the azimuth and eleva-tion mounting.

f. Loosen the azimuth calibration clamp.g. Lower the lock lever (not shown) on the

side of the compass,h. Rotate the azimuth and elevation mount-

ing until the compass needle is approximatelyover the S mark on the compass face.

i. Tighten the azimuth calibration clamp andturn the azimuth calibration adjustment (fig.4) until the compass needle lines up exactlyover the S mark on the compass face.

j. Raise the compass lock lever to its upperposition to secure the internal mechanism.

Note. Do not touch the azimuth calibration clamp orthe azimuth calibration adjustment after the theodo-litc has been oriented.

k. Establish datum lines (par. 24).

19. Orienting by SunThe following method of orientation applies

only to theodolite locations bet between 22½ 0 northlatitude and 22½° south latitude. The orienta-tion must take place at solar noon,

a. Use the following procedure to determinethe local standard time at which solar noonwill occur.

(1) Use the equation-of-time graph (fig,7) and determine the mean time, bythe following procedure:

(a)

(b)

(c)

Locate the applicable vertical dateline.Note the point where the verticaldate line intersects the curved line,Follow the horizontal line from thepoint of intersection to find the cor-rection in minutes.

Example 1. Date=l JuneCorrection in minutes=

—3Mean time=l157

Example 2. Date=l AugustCorrection in minutes

+6Mean time=1206

13

LEVELINGS C R E W

LEVELINGP L A T E

Figure 6. Leveling screw adjustment.

Determine the difference in longi-tude between the theodolite locationand the standard meridian for thearea.Mulultiply the difference by 4.If the longitude of the theodolitelocation is greater than the stand-ard meridian, subtract; if less, addthe correction obtained in step (b)above.

Example 1. Theodolite location=73°longitude

Standard meridian=75°longitude

Difference in degrees=2°

Difference in minutes=8 minutes (4 minutesper degree)

Mean time=1157Local standard time=

1205Example 2. Theodolite location=77°

longitudeStandard meridian=75°

longitudeDifference in degrees=

2°Difference in time=8

minutes (4 minutesper degree)

Mean time= 1206Local standard time=

1158Notc. If daylight saving time is in effect,

add 1 hour to the local standard time.b. Prepare the theodolite. Do not sight the

theodolite on the sun until some provision hasbeen made to reduce the intense light, such asplacing a smoked glass or one or more densephotographic negatives over the lens.

Warning: Permanent injury to the eyes canbe caused by viewing the sun through thetheodolite unless a protective measure (b above)is taken.

c. Sight the sun as follows:(1) Set the azimuth scale as indicated be-

l o w :

14

(a) North of the tropic zone-set thescale at 1800.

(b) South of the tropic zone-set the

(2)(3)(4)

(5)

(6)

(7)

(8)

scale at 0°.Engage the azimuth tracking control.Loosen the azimuth calibration clamp.Sight the telescope on the sun (fig. 8)several minutes before solar noon.About 30 seconds before solar noon,tighten the azimuth calibration clamp.Track the sun by turning the azimuthcalibration adjustment. Position thecross hairs as shown in figure 8.Stop turning the azimuth calibrationadjustment at exactly solar noon.

Note. The theodolite is now oriented. Donot loosen the azimuth calibration clamp orturn the azimuth calibration adjustment.Establish datum lines (par. 24).

20. Orienting by PolarisNote. The following method of orientation applies

only to theodolite locations between 10° and 70° northlatitude. Refer to paragraph 21 for theodolite loca-tions in southern latitudes.

a. Use the Polaris culmination time graph(fig. 9) and determine the local standard timefor Polaris at upper culmination.

Note. If upper culmination occurs during daylighthours, use lower culmination.

b. Disengage the azimuth tracking control(fig. 4) and turn the azimuth and elevationmounting (fig. 2) until the fiducial marker ofthe azimuth scale (fig. 4) lines up with O ± theazimuth variation of Polaris from true north(j below) and engage the azimuth trackingcontrol.

c. Loosen the azimuth calibration clamp.d. Locate Polaris as follows:

(1)

(2)

(3)

Open the technical manual to figure10, face north and hold the technicalmanual in a reading position.Rotate the technical manual until theappropriate month is at the top offigure 10 to determine the appearanceof the northern sky at 2100 hourslocal standard time.

Note. To determine the appearance of thesky for local standard time at times otherthan 2100 hours, count off one radial linefor each hour and hold figure 10 with thefinal radial line pointing to the top of thefigure and ignore the month.Locate Polaris.

TAGO 863A

(2) Convert the mean time into localstandard time.

(a)

(b)

(c)

TM6675-200-I0-7

Figure 7. Equation-of-time graph.

TAGO 863A 15

Figure 8. Cross hair tracking of sun..

e. Sight the telescope on Polaris severalminutes before culmination (a above).

f. Position the cross hairs of the telescopedirectly on Polaris.

g. About 30 seconds before culmination,tighten the azimuth calibration clamp (fig. 4).

h. Track Polaris by adjusting the azimuthcalibration adjustment.

i. Stop adjusting the azimuth calibration ad-justment exactly at culmination.

Note. Do not touch the azimuth calibration clampor the azimuth calibration adjustment after the the-odolite has been oriented.

j. To determine the azimuth variation ofPolaris from true north, refer to tables I, II,III, or IV. Each table gives the variation ofPolaris quarterly for specified latitudes andtimes. The same variation that applies to agiven time on any one day will apply 3.93minutes earlier each successive day.

Problem:

Solution:

Referring to table III, we findthat on July 1, Polaris is .8”east of north at 2217 hours onlatitude 40°. At what time willPolaris be .8° east of north onJuly 11?Number of days later=10Correction for each day=3.93minutes earlier10 x3.93 minutes=39.3 minutes22 hours 17 minutes minus 39.3minutes=21 hours 37.7 minutesPolaris will be .8° east of northat 2137.7 hours July 11 on lati-tude 40°.

k. Establish datum lines (par. 24).

16 TAGO 863A

17

Table I. Azimuth of Polaris From True North, First Quarter

Latitude Date and Universal Time(Greenwich mean time)

Mar 1

15181818211800210320062009201219

60° 65°

0.0 ().0+1.3 + 1.6+1.8 +2.2+ 1.3 +1.5

0.0 0.0—1.3 —1.5—1.8 —2.2—1.3 —1.6

—

Jan. 1 Feb 1

1912 17092211 20090115 23080414 02120714 05111013 08111313 11101612 1410

25°

0.0+0.7+1.0+0.7

0.0—0.7—1.0—0.7

50°

0.0+1.0+1.4+ 1.0

0.0–1.0—1.4–1.0

55°

0.0+1.1+1.6+1.1

0.0—1.1—1.6—1.1

10°

0.0+0.7+0.9+0.7

0.0—0.7—0.9—0.7

30°

0.0+0.8+1.1+0.8

0.0—0.8—1.1—0.8

35°

0.0+ 0.8+1.1+0.8

0.0—0.8—1.1—0.8

40°

0.0+0.9+1.2+0.8

0.0—0.8—1.2—0.9

45°

0.0+0.9+1.3+0.9

0.0—0.9—1.3—0.9

70°

0.0+ 2.0+2.7+1.8

0.0—1.8—2.7—2.0

See footnotes at end of table IV.

Table II. Azimuth of Polaris From True North, Second Quarter

Date and Universal Time(Greenwich mean time) Latitude

May 1

11181418171720172316022005190819

J u n 1

09171216151618152115001803180617

40°

0.0+0.9+1.2+0.8

0.0—0.8—1.2- 0 . 9

Apr. 1

13161616191522150118041807171017

10°

0.0+0.7+0.9+0.7

0.0- 0 . 7- 0 . 9- 0 . 7

25°

0.0+0.7+1.0+0.7

0.0- 0 . 7—1.0- 0 . 7

30°

0.0+0.8+1.1+0.8

0.0- 0 . 8—1.1- 0 . 8

35°

0.0+0.8+1.1+0.8

0.0- 0 . 8—1.1- 0 . 8

55°

0.0+1.1+ 1.6+1.1

0.0—1.1—1.6—1.1

60°

0.0+1.3+ 1.8+ 1.3

0.0—1.3—1.8—1.3

45°

0.0+0.9+1.3+0.9

0.0- 0 . 9—1.3- 0 . 9

50°

0.0+1.0+1.4+1.0

0.0—1.0—1.4—1.0

70” I65°

0.0+1.6+2.2+1.5

0.0—1.5—2.2—1.6

0.0+ 2.0+2.7+1.8

0.0—1.8—27—2.0

See footnotes at end of table IV.

18

Table III. Azimuth of Polaris From True North, Third Quarter

Date and Universal Time(Greenwich mean time) Latitude

40°

0.0+0.9+ 1.2+0.8

0.0—0.8—1.2—0.9

45°

0.0+0.9+ 1.3+ 0.9

0.0—0.9—1.3—0.9

Sep 1

03170616091612161515181421140018

70°

0.0+ 2.0+ 2.7+1.8

0.0—1.8—2.7—2.0

10°

0.0+0.7+0.9+0.7

0.0—0.7—0.9—0.7

25°

0.0+0.7+1.0+ 0.7

0.0—0.7—1.0—0.7

30°

0.0+ 0.8+1.1+0.8

0.0—0.8—1.1—0.8

35°

0.0+0.8+1.1+0.8

0.0—0.8—1.1—0.8

50°

0.0+1.0+1.4+1.0

0.0—1.0—1.4—1.0

55°

0.0+1.1+1.6+1.1

0.0—1.1—1.6—1.1

60°

0.0+1.3+1.8+1.3

0.0—1.3—1.8—1.3

65°

0.0+ 1.6+ 2.2+1.5

0.0—1.5—2.2—1.6

Aug 1Jul 1

05180818111714171716201623150219

07201019131816181918221701200420

See footnotes at end of table IV.

Table IV. Azimuth of Polaris From True North, Fourth Quarter

Date and Universal Time( Greenwich mean time) Latitude

40°

0.0+0.9+ 1.2+0.8

0.0—0.8—1.2—0.9

45°

0.0+ 0.9+ 1.3+0.9

0.0—0.9—1.3- 0 . 9

—

50°

0.0+1.0+1.4+1.0

0.0—1.0—1.4—1.0

55°

0.0+1.1+ 1.6+1.1

0.0—1.1—1.6—1.1

65°

0.0+1.6+2.2+1.5

0.0—1.5—2.2—1.6

70”

0.0+2.0+2.7+1.8

0.0—1.8—2.7—2.0

Nov 1

23140217051708161116141517152014

Dec 1

21160019031906180918121715171816

25°

0.0+0.7+1.0+0.7

0.0—0.7—1.0—0.7

35°

0.0+0.8+1.1+0.8

0.0—0.8—1.1—0.8

30°

0.0+0.8+1.1+0.8

0.0—0.8—1.1—0.8

Oct 1

012004190718101813181617 19162216

10° 60°

0.0+ 1.3+1.8+1.3

0.0—1.3—1.8—1.3

0.0+0.7+0.9+0.7

0.0—0.7—0.9—0.7

Figure 9. Polaris culmination time graph.

Orienting by Equal Angles

Northern Hemisphere.

(1)

(2)

(3)

(4)

TAGO 863A

Disengage the azimuth tracking con-trol (fig. 4) by pulling it away fromthe elevation scale.

Turn the azimuth and elevation (5)mounting until the fiducial marker ofthe azimuth scale lines up with O.Engage the azimuth tracking control. (6)Loosen the azimuth calibration clampand sight a nearby easily visible refer-ence point by rotating the azimuthand elevation mounting.Tighten the azimuth calibration clampand adjust the azimuth calibration ad- (7)justment until the cross hairs of the

telescope are centered on the referencepoint ( (3) above).

Note. Do not touch the azimuth calibra-tion clamp and the azimuth calibration ad-justment after performing the proceduregiven in (4) above.

Disengage the azimuth tracking con-trol and the elevation tracking con-trol.

Select a conspicuous star in the north-northwestern sky that is approxi-mately 30° or 40° from Polaris.

Note. The star selected for observationmust be used throughout the series of ob-servations.

Sight the star through the telescopeand engage the azimuth tracking con-

19

(8)

(9)

(lo)

(11)

NOTE:EACH RADIAL LINE DENOTES 2100 HOURS LOCAL STANDARDTIME FOR PORTION OF MONTH IN WHICH IT TERMINATES

trol and the elevation tracking control.Track the star (fig. 11) and note theazimuth and elevation when the star isapproximately 2 hours from culmina-tion during its descent.Make two additional observations at20-minute intervals and note theazimuth and elevation.Track the ascent and note the azimuthwhen the elevation of the star is ex-actly the same as the third observa-tion, the second observation and thefirst observation.Determine the midpoint of each ofthe following azimuths noted in (8)through (10) above:

(a) First observation to sixth observa-tion.

(b) Second observation to fifth obser-vation.

20

T N 6 6 7 5 - 2 0 0 - 1 0 - 1 0

Figure 10. Method of locating Polaris

(c) Third observation to fourth obser-

(12)

(13)

(14)

(15)

(16)

vation.Determine the average azimuth ofthe three midpoints ( (11) above).Subtract the average azimuth of thethree midpoints from 360°.Disengage the azimuth tracking con-trol (fig. 4) and turn the azimuth andelevation mounting (fig. 2) until thefiducial marker of the azimuth scalelines up with the difference obtainedas indicated in (12) above.Engage the azimuth tracking control(fig. 4) and loosen the azimuth cali-bration clamp.Rotate the azimuth and elevationmounting and sight the reference point( (14) above).Tighten the azimuth calibrationclamp.

TAGO 863A

.-

THEODOLITELOCATION T M 6 6 7 5 - 2 0 0 - 1 0 - 1 3

Figure 11. Determination of true north by equal angles.

(17) Adjust the azimuth calibration adjust-ment until the cross hairs of the tele-scope are directly centered on thereference point.

Note. Do not touch the azimuth calibra-tion clamp and the azimuth calibration ad-justments or the orientation will be thrown

(18) Establish datum lines (par. 24).b. Southern Hemisphere.

(1)

(2)

TAGO 863A

Perform the procedures given in a (1)through (5) above.Select a conspicuous star in the south-southwestern sky for use throughoutthe series of observations.

(3) Perform the procedures given in a (7)through (18).

c. Sun. The equal-angles method may beused also in observations of the sun. The firstthree observations, however, must be made onthe sun as it rises toward culmination and thelast three observations as it descends. The sunoccupies a large portion of the field of thetheodolite, and it cannot be centered in thefield as accurately as a star. To increase theaccuracy of the observation, position the crosshairs over the sun (fig. 12). If the observationis being taken in the morning, place the rightedge of the sun tangent to the vertical crosshair; if the observation is being taken in the

21

TM6675-200-10-11

Figure 12. Method of sighting sun for equal angles.

afternoon, place the left edge of the sun tangentto the vertical cross hair.

22. Orienting by Datum Lines

Datum lines must be established(par. 24) to perform the following:

a. Erect the tripod (par. 14).b. Set up the theodolite (par. 15).

previously

c. Attach a plumb-bob string to the eyeletunder the leveling plate (fig. 4).

d. Center the tripod and the attached theo-dolite until the tip of the plumb-bob is directlyover the observation point.

e. Perform the leveling procedures (par. 10).f. Adjust the azimuth tracking control until

the fiducial marker of the azimuth scale linesup with the azimuth of the first reference point(par. 23f).

g. Adjust the elevation tracking control un-til the fiducial marker of the elevation scalelines up with the elevation of the first refer-ence point.

h. Loosen the azimuth calibration clamp.i. Rotate the azimuth and elevation mount-

ing (fig. 2 ) until the cross hairs of the tele-scope are centered on the first reference point.

j. Tighten the azimuth calibration clamp(fig.2).

k. Adjust the azimuth calibration adjust-ment until the cross hairs of the telescope arecentered on the first reference point.

Note. Do not touch the azimuth calibration clamp andthe azimuth calibration adjustment after performingthe procedure in j above.

l. Adjust the azimuth tracking control untilthe fiducial marker of the azimuth scale is lined

22

up with the azimuth of the second referencepoint (par. 23g).

m. Adjust the elevation tracking control un-til the fiducial marker of the azimuth scale islined up with the elevation of the second ref-erence point.

n. Check to see that the cross hairs of thetelescope are centered on the second referencepoint.

o. If a third reference point (par. 23g) isavailable, perform the procedures given in kthrough m above.

Note. If the cross hairs of the telescope do not lineup with the second or third reference point, repeat theprocedures given in a through n above,

23. Orienting by TransferenceTo transfer the theodolite location, after the

theodolite has been oriented (pars. 18, 19, 20,21, 22, or 24), proceed as follows:

a. Sight the telescope on a marker held at anew location.

b. Adjust the azimuth tracking control andthe elevation tracking control until the crosshairs of the telescope are centered on themarker.

c. Note the azimuth of the marker.d. Determine the azimuth of the observa-

tion point (par. 24e) from the marker. If theazimuth of the marker is greater than 180”subtract 180°. If the azimuth is less than 180°,add 180°.

e. Transfer the theodolite and tripod to thelocation of the marker.

f. Center the tripod and theodolite over thelocation of the marker.

g. Perform the leveling procedures (par.16) .

h. Adjust the azimuth tracking control untilthe fiducial marker of the azimuth scale linesup with the azimuth of the observation point(d above).

i. Loosen the azimuth calibration clamp andsight the original observation point by rotatingthe azimuth and elevation mounting (fig. 2).

j. Tighten the azimuth calibration clamp(fig. 4).

k. Adjust the azimuth calibration adjust-ment until the cross hairs of the telescope arecentered on the observation point.

TAGO 863A

Note. Do not touch the azimuth calibration clampand the azimuth calibration adjustment after perform-ing the procedures given in k above.

l. Establish datum lines (par. 24).

24 Establishing Datum lines(fig. 4)

When the theodolite is oriented, establishdatum lines as follows.

a. Attach the plumb-bob string to the eye-let under the leveling plate.

b. Adjust the plumb-bob cord until theplumb-bob is approximately one-half inch fromthe ground or hard surface.

c. Establish an observation point at the tipof the plumb-bob and remove the plumb-bob.

d. Mark the observation point. If the tri-pod is set up on the ground, a small stake canbe used. If the tripod is set up on a hard sur-face, a painted spot can be used.

e. Select a permanent landmark for a ref-erence point.

f. Adjust the azimuth tracking control andthe elevation tracking control until the crosshairs of the telescope are centered on the ref-erence point.

g. Note the azimuth and elevation and a com-plete description of the reference point as anestablished datum line.

h. Repeat the procedures given in d throughf above a second reference point and, if pos-sible, on a third reference point.

Note. When establishing datum lines at night (e-gabove), select a fixed light source for a reference point.

i. Post the established datum line informa-tion in a convenient place, such as the door ofthe carrying case or in the weather station.

25. Presetting Controls(fig. 4)

a. Disengage the azimuth tracking controlby pulling it out from the azimuth and elevationmounting.

b. Disengage the elevation tracking controlby pushing it down on the azimuth and eleva-tion mounting.

c. Position the finder-tracking lever awayfrom the focusing eyepiece.

d. If night operation is intended, preset theadditional controls:

(1) On the ML-474/GM, proceed as fol-lows :

(a)

(b)

Operate the scale lamp switch (fig.4) to the ON position.Operate the rheostat (fig. 4) fromthe OFF position to “the positionthat gives the desired cross hair il-lumination.

(2) On the ML-47-(*) and ML-247-(*),proceed as follows:

(a)

(b)

Operate the scale lamp switch andthe cross hair lamp switch to theON position.Operate the rheostat to the positionthat gives the desired cross hairillumination.

Section Ill. OPERATION UNDER USUAL CONDITIONS

26. Tracking Objecta. Grasp the theodolite as shown in figure 13.b. Aline the short sights (fig. 4) on the ob-

ject and track the object by hand until itscourse becomes apparent.

Note. If the base of the azimuth and elevationmounting interferes with the rear sight, raise theextension sights (fig. 4 ) and track the object.

C. Engage the azimuth tracking control (fig.4) and the elevation tracking control.

d. Shift the eye to the focusing eyepiece andtrack the object by operating the azimuth

TAGO 863A

tracking control and the elevation tracking con-trol (fig. 14).

e. Center the cross hairs of the telescope onthe object and operate the finder-tracking lever(fig. 4) toward the focusing eyepiece.

f. Keep the cross hairs centered on the ob-ject and read the scales (par. 27) until thetracking is complete.

Note. If the object is lost from the field of view,operate the finder-tracking lever away from the focus-ing eyepiece. When the cross hairs are again centeredon the object, operate the finder-tracking lever towardthe focusing eyepiece and continue tracking.

23

27. Reading Scalesa. Operate Timing and Telephone Set ML-

110 (TM 11–334) to provide time interval sig-nals.

Note. If Timing and Telephone Set ML-110 is notavailable, use a stopwatch or a clock.

b. At the beginning of the tone, be certainthat. the cross hairs of the telescope are cen-tered on the object.

c. While listening to the tone, observe theposition of the fiducial marker on the azimuthand elevation scales (fig. 4).

d. When the tone stops, call out the exactreading indicated on the azimuth scale, theazimuth tracking control, the elevation scale,and the elevation tracking control.

Note. The azimuth scale and elevation scale indicateazimuth and elevation in degrees, Tenths of degreesare indicated on the azimuth tracking control andelevation tracking control,

28. Stopping ProceduresAt the completion of the observation proceed

as follows:a. Operate the scale lamp switch and the

24

rheostat to the OFF position (ML-474/GM),or operate the scale lamp switch and the crosshair lamp switch to the OFF position (ML-47-(*) or ML-247-(*)).

b. Replace the lens cap on the telescope lensand the sunshade on the base plate block.

c, Place the cover on the theodolite if it isto be kept in readiness for a later observation.

d. If no more observations are intended,place the theodolite in the carrying case asfollows :

(1)

(2)

(3)

(4)

Unscrew the theodolite from the tri-pod mount by turning the levelingplate (fig. 4 ) counterclockwise.Screw the theodolite to the base plateby turning the leveling plate clock-wise.

Disengage the azimuth tracking con-trol by pulling it out from the azimuthscale.Disengage the elevation tracking con-trol by pulling it down from the ele-vation scale,

TAGO 863A

Figure 13. Tracking object using sights.

(5)

(6)

Swing tile tracking telescope verti- groove in the bottom of the case. Thetally to invert it so that the sights trackiug telescope lens will fit into theare on the bottom. left rear corner of the case.Place the theodolite in its carrying (7) Close the carrying case door and se-case by sliding the base plate into its cure the catches.

Section IV. OPERATION UNDER UNUSUAL CONDITIONS

29, Operation in Arctic ClimatesSubzero temperatures and climatic condi-

tions associated with cold weather affect theoperation of the theodolite. If equipment thathas been exposed to the cold is brought intoa warm room, moisture will gather on it andcause changes in operating characteristics. Drythe equipment thoroughly.

30. Operation in Tropical ClimatesMoisture conditions are more acute in tropi-

cal, swampy areas. The high relative humiditycauses moisture condensation on the equip-ment when the temperature of the equipment

drops below that of the surrounding air. Ade-quate ventilation will minimize this condition,Dry tile equipment thoroughly before operatingit.

31. Operation in Desert Climates

Provide means for keeping dust and sandfrom entering the moving parts of the theodo-lite. Grit, resulting from the mixture of lubri-cant and sand, will damage the equipment.Clean the equipment often and cover it whennot in use. Protect the equipment from thedirect rays of the sun if possible.

25

Figure 14. Tracking object using focusing eyepiece

CHAPTER 4

PREVENTIVE MAINTENANCE

32. Scope of Operator’s Maintenance

Following is a list of maintenance dutiesnormally performed by the theodolite operator.These procedures do not require test equip-ment.

a.b.

37).c.d.

36) .

Preventive maintenance (par. 34).Replacement of lamps and batteries (par.

Lubrication (par. 35).Equipment performance checklist (par.

33. Tools and Materials Required

Tools and materials required for mainte-nance of the theodolite are listed below.

a. Furnished.Screw Driver TL-22Hand oiler, 2.5 cc, 2 inches high by 3/&inch diameter.

b. Not Furnished.Camel’s-hair Brush TL-72 ( ½ in. flat)Wiping cloth, FSN 8305–170-5063Lens tissue, FSN 6640–393–2090Lubricating oil, general purpose, preserva-

tive ( PL Special ), 4 oz. can/spout, FSN9150–273–2389

Lubricating oil, watch (OCW), 5 cc, bot-tle/fine dropper FSN 9150–252–6382

34. Preventive Maintenance

a. Check the equipment for agreement withthe table of components (par. 5).

b. Check for worn, loose, or missing partsand screws.

c. Tighten all loose screws, except the ad-justment screws.

d. Inspect all moving parts for smooth oper-ation and report any malfunction to higherechelon for repair.

e. Clean and dust all exterior surfaces.

26

f. Clean and inspect the focusing eyepiecelens, the tracking telescope lens, and the findertelescope lens.

(1) Use a camel’s-hair brush to removeall loose dust and dirt.

(2) Use lens tissue to remove any remain-ing foreign matter.

g. Inspect the lenses for scratches, chips,cracks, or discoloration and report defects forhigher echelon repair.

35. Lubrication

a. Place a drop of oil (OCW) on each ac-cessible working surface and on each wormgear associated with the azimuth tracking con-trol and the elevation tracking control.

b. Moisten a cloth with oil (PL Special)and carefully apply a film of oil to the eleva-tion scale.

c. Moisten a cloth with oil (PL Special) andapply a film of oil to all the metallic and paintedsurfaces.

d. Remove all excess oil with a clean cloth.

36. Equipment Performance Checklist

Use the equipment performance checklistto check equipment performance systemati-cally. All corrective measures which the op-erator can perform are given in the correctivemeasures column. If the action does not cor-rect the fault, additional maintenance must beperformed by higher echelon maintenance per-sonnel. The operator should note on the re-pair tag how the equipment performed andwhat corrective measures were taken. In us-ing the checklist, start at the beginning andfollow each step in order to locate trouble. Iftrouble is suspected in a particular area, how-ever, start checking at that point and continuethe steps sequentially.

TAGO 863A

Item No.

123

4

5

Item

Set up tripod (par. 14).Set up theodolite (par. 15).Level theodolite (par. 16).

Focus theodolite (par. 17).

Batteries.

Action or condition

Adjust leveling screws.

Adjust focusing eyepiece whileviewing through focusing eye-piece.

Adjust focusing control whileviewing object.

Install batteries in battery com- partment.

Normal indications

Bubble in each level center.

cross hairs become sharp and dis-tinct.

Object becomes sharp and dis-tinct.

Corrective measures

Turn in equipment for higherechelon repair.

Clean lens of focusing eyepieceand finder telescope (par.

Turn in equipment for higherechelon repair.

Place finder-tracking level in op-posite position.

Clean lens of tracking telescope(par.

Turn in equipment for higherechelon repair.

Azimuth tracking control (fig. 4). Disengage. Pulls outward from azimuth and Turn in equipment for higherelevation mounting. echelon repair.

Elevation tracking control. Disengage. Pulls downward from azimuth Turn in equipment- for higherand elevation mounting. echelon repair.

Tinder-tracking lever. Move toward focusing eyepiece Moves freely. Turn in equipment for higherand then away from focusing echelon repair.eyepiece.

6

7

8

28

Item No.

9

10

11

12

13

14

15

16

17

18

19

20

Item

Azimuth calibration adjustment.

Azimuth calibration clamp.

Azimuth and elevation mounting(fig. 2).

Orient theodolite (par. 18, 19,20, 21 or 22).

Sights.

Azimuth tracking control andelevation tracking control (fig.4).

Focusing eyepiece.

Finder-tracking lever.

Scale lamp switch.

Cross hair lamp switch. (ML-47-(*) or ML-247-(*)).

Brightness control:ML-47-(*) or ML--247-(*).

ML-474/GM.

Compass.

21

22

23

Scale lamps switch.

Cross hair lamp switch (ML-47-(*) or ML-247-(*)).

Brightness control (ML-474/GM).

Action or condition

Adjust for approximate centerposition.

Loosen.

Slowly rotate through 360°.

Rotate azimuth and elevationmounting and sight an object.

Engage both controls and adjustthem until sights are lined upon object (13 above).

View object through focusing eye-piece.

Move lever toward focusing eye-piece.

Operate to ON position.

Operate to ON position.

Vary position of control.

Vary from extreme counterclock-wise to clockwise position.

Adjust the azimuth tracking con-trol until fiducial marker ofazimuth scale lines up withbearing to true north.

Operate to OFF position.

Operate to OFF position.

Turn completely clockwise.

Normal indications

Turns without binding.

Turns without binding.

Rotates without binding.

Telescope will move to properposition.

Cross hairs should be centered onobject.

Cross hairs should be centered onobject.

Scale lamps will light.

Cross hairs will glow when viewedthrough focusing eyepiece.

Glow on cross hairs will increaseand decrease.

Cross hairs will glow and vary inbrillance.

Needle of compass is centeredover S mark.

Corrective measures

Turn in equipment for higherechelon repair.

Turn in equipment for higherechelon repair.

Turn in equipment for higherechelon repair.

Turn in equipment for higherechelon repair.

Turn in equipment for higherechelon repair.

Turn in equipment for higherechelon repair.

Replace batteries (par. 37a).Replace scale lamps (par. 37b ).Replace cross hair lamp (par.

37 b).

Turn in equipment for higherechelon repair.

Turn in equipment for higherechelon repair.

Turn in equipment for higherechelon repair.

Scale lamp will extinguish. Turn in equipment for higherechelon repair.

Cross hair lamp will extinguish. Turn in equipment for higherechelon repair.

Cross hair lamp will extinguish. Turn in equipment for higherechelon repair.

37. Replacement of Batteries and Lamps

a. Batteries.

(1) Loosen the catch on the top of thebattery compartment.

(2) Open the battery compartment andremove the batteries.

(3) Install new batteries. Be sure thatthe base of each battery contacts thesprings.

(4) Close the battery compartment andfasten the catch.

b. Lamps.(1) Twist the scale lamp covers on the

bayonet bases and remove the covers.(2) Remove the old scale lamps and in-

stall the new lamps.(3) Twist the cross hair lamp socket base

and pull the cross hair lamp base andlamp from the cross hair lamp cover.

(4) Remove the old cross hair lamp andinstall the new lamp.

(5) Insert the cross hair lamp and lampsocket into the cross hair lamp cover.Lock in place by twisting the socketin the bayonet base lock.

TAGO 863A 29

CHAPTER 5

SHIPMENT AND LIMITED STORAGE AND DEMOLITION TO PREVENT ENEMY USE

Section I. SHIPMENT AND LIMITED STORAGE

38. Disassembly of Equipment(figs. 1, 2, 4, and 5)

The following instructions are recommendedas a guide for preparing the theodolite set forshipment and storage. The actual procedureand extent of disassembly will depend on thesituation. The disassembly procedure reversesthe assembly procedure given in paragraph 15.

a. Remove the batteriescompartment (fig. 2) and(fig. 1).

b. Remove the lens hoodtracking telescope (fig. 4),

c. Place the lens cap (fig.telescope (fig. 4).

from the batterythe battery racks

(fig. 1) from the

4) on the tracking

d. Place the lens hood (fig. 1) on the blockprovided on the base plate and remove thescrewdriver from the other block.

e. Unscrew the theodolite (fig. 4) from themount (fig. 5) by turning the leveling platecounterclockwise.

f. Screw the theodolite to the base plate (fig.1 ) by turning the leveling plate clockwise.

g. Disengage the elevation tracking control.

h. Lower the extension sights (fig. 4) andposition the telescope with the short sightsand the extension sights underneath.

i. Disengage the azimuth tracking controland rotate the azimuth and elevation mountinguntil the tracking telescope is pointing towardthe left rear.

j. Replace the screwdriver (d above).k. Slide the base plate and attached the-

odolite into the carrying case so that the track-ing telescope lens is to the left rear of thecarrying case.

l. Engage the azimuth tracking control andthe elevation tracking control.

m. Close the carrying case door and fastenthe catches.

39. Repacking for Shipment or limitedStorage

The exact procedure in repacking for ship-ment or limited storage depends on the ma-terials available and the conditions under whichthe equipment is to be shipped or stored. Referto paragraph 10b and reverse the sequence ofoperation given for unpacking the equipment.

Section Il. DEMOLITION OF MATERIEL TO PREVENT ENEMY USE

40. Authority for Demolition

Demolition of the equipment will be accom-plished only upon the order of the commander.The destruction procedures outlined in para-graph 41 will be used to prevent further useof the equipment.

41. Methods of Destruction

Use any of the following methods:a. Smash. Smash the controls, lenses, levels

and scales; use sledges, axes, handaxes, pick-axes, hammer, or crowbars.

30

b. Cut. Cut the wiring harness; use axes,handaxes, or machetes.

c. Burn. Burn the carrying case and tech-nical manuals; use gasoline, kerosene, oil, flamethrowers, or incendiary grenades.

d. Bend. Bend battery compartment andlamp covers.

e. Explode. If explosives are necessary, usefirearms, grenades, or TNT.

f. Dispose. Bury or scatter the destroyedparts in slit trenches, fox holes, or throw theminto streams.

TAGO 863A

APPENDIX I

The following publications contain informa- TM 11-487G Directory of Signal Corpstion applicable to the operator of Theodolites Equipment; Meteorolo-ML47– (*), ML-247– (*), and Double Center gical EquipmentTheodolite ML-474/GM. TM 11–2406 Meteorological Station AN

TM 11-334 Timing and Telephone Set /TMQ-lML-11O TM 11–2426 Meteorological Station AN

TM 11-415 Dry Batteries /TMQ-4

TAGO 863A 31

REFERENCES

APPENDIX II

GLOSSARY

Culmination. Uppermost and lowermost points Mean Time. The time established when cor-of an orbit.rection is applied to solar time for a specificMeridian. Line of longitude.time of year.Standard Meridian. The line of longitude in

the exact center of a time zone.Solar Noon. Sun culmination time over a spe-Local Standard Time. The time established

cific point.for a particular time zone.[AG 413.72 (26 Jun 58)]

B Y O RDER OF THE S ECRETARIES OF THE A RMY AND THE A IR F O R C E:

Official:HERBERT M. JONES

Major General, United States Army,The Adjutant General.

OFFICIAL :J. L. TARR

Colonel, United States Air ForceDirector of Administrative Services.D ISTRIBUTION :

Active Army:ASA (2)CNGB (1)Technical Stf, DA (1) except

CSigO (30)Technical Stf Bd (1)USCONARC (5)USA Arty Bd (1)USA Armor Bd (Incl ea Test

See)(l)USA Inf Bd (1)USA Air Def Bd (Incl ea

Test See) (1)USA Abn & Elct Bd (1)USA Avn Bd (1)USA Arctic Test Bd (1)US ARADCOM (Incl ea

Rgn Cored) (2)OS Maj Comd (5)Log comd (5)MDW(1)Armies (5)Corps (2)Div (2)Ft & Camp (2)SVC College (5)Br. Svc Sch (5) except

USASCS (25)

MAXWELL D. TAYLOR,General, United States Army

Chief of Staff.

Sig See, Gen Depot (10)Sig Depot (17)Port of Emb (OS) (2)OS SUP Agcy (2)Sig Fld Maint Shop (3)Sig Lab (5)USA Sig pub Agcy (8)USA Arty & Msl Cen (100)Army Pictorial Cen (2)USASSA (Phila, Pa) (13)SP Wpn Cored (5)White Sands Sig Agcy (13)USA Elct PG (1)Dugway PG (5)Jefferson PG (5)USA Corn Agcy (2)Redstone Arsenal (5)WRAMC (1)USAMS (1)Engr Maint Cen (1)AFIP (1)USA Sig Com Engr Agcy

(1)Mil Dist (1)USA Corps (Res) (1)Sectors, USA Corps (Res)

(1)

THOMAS D. WHITEChief of Staff, United States Air Force.

Gen Depot (z) exceptAtlanta Gen Depot (None)

NG: State AG (6) ; units—same as Active Army except allowance is one copy to each unit.USAR : None.

6-100 (2)

JBUSMC (2)Units org under the fol TOE:

6-101 (2)6-200 (2)6-201 (2)6-300 (2)6-301 (2)6-525 (2)6–575 (2)6-576 (2)6-577 (2)11-7 (2)11-16 (2)11–57 (2)11-127 (2)11-128 (2)11–500 (AA-AE) (2)11-557 (2)11-587 (2)11-592 (2)11-597 (2)39–61 (2)44-12 (2)44-16 (2)44-36 (2)44-101 (2)44-112 (2)44-116 (2)44-201 (2)

For explanation of abbreviations used, see AR 320-50.

U. S. GOVERNMENT PRINTING OFFICE: 1958—48050232

TAGO 863A

✩

TM 11-6675-200-10/TO 49A1-1-101

This fine document...

Was brought to you by me:

Liberated Manuals -- free army and government manuals

Why do I do it? I am tired of sleazy CD-ROM sellers, who take publicly available information, slap “watermarks” and other junk on it, and sell it. Those masters of search engine manipulation make sure that their sites that sell free information, come up first in search engines. They did not create it... They did not even scan it... Why should they get your money? Why are not letting you give those free manuals to your friends?

I am setting this document FREE. This document was made by the US Government and is NOT protected by Copyright. Feel free to share, republish, sell and so on.

I am not asking you for donations, fees or handouts. If you can, please provide a link to liberatedmanuals.com, so that free manuals come up first in search engines:

<A HREF=http://www.liberatedmanuals.com/>Free Military and Government Manuals</A>

– SincerelyIgor Chudovhttp://igor.chudov.com/

– Chicago Machinery Movers