EquipmentThe information reported here is obtained from

manufacturers and from other sources consideredto be reliable. Science does not assume responsibil-ity for the accuracy of the information. A couponfor use in making inquiries concerning the itemslisted is included in the post card insert.

* CABLE EVALUATOR automatically testsfor leakage and continuity between anyand all wire terminations of a cable har-ness or device. The unit includes twoscanning circuits, a tape reader andcode storage unit, a tape punch, an out-put printer, and leakage- and continuity-detection circuitry. The tape is punchedto record continuity found in the test ofa reference sample device. Tape pro-duced in this way is used to programthe device for comparison tests of otherequipment. (James Cunningham Sonand Co., Inc., Dept. 409)

* X-RAY FLUORESCENCE SPECTROMETER

permits simultaneous analysis of up to22 elements in the wavelength range0.35 to 10.2 A. A ratio-recording systemprovides inked records showing the con-centrations of the elements analyzed.(Applied Research Laboratories, Inc.,Dept. 406)

* CRYSTAL OVEN employs a mercurythermoswitch to provide temperaturecontrol. Oven temperature is maintained±0.010C at fixed ambient and ±0.1'Cover an ambient range of 00 to 50"C.The unit operates on 24 v d-c or 6.3 va-c. Pressurized inert gas above the mer-cury column prevents mercury separa-tion under shock and vibration. Theoven accommodates an HC-6/U crystalholder. (Manson Laboratories Inc.,Dept. 410)

* STREAK CAMERA produces a plot ofspace in one direction versus time in anorthogonal direction of self-luminousevents. Standard 35-mm film is used.The image is swept onto the film by atriangular mirror rotated by a high-speedturbine. The fastest drive available rangesfrom 200 to 5500 rev/sec. Maximumwriting rate is approximately 8 mm/gsec. Control equipment includes a fre-quency counter for measurement ofmirror speed, mirror speed adjustments,and controls for the capping shutter andthe explosive-actuated blast shutter usedto prevent double exposure. (Beckmanand Whitley, Inc., Dept. 411)

* NUCLEAR-COUNTER SIMULATOR for use

in developing and testing radiationcounting instruments provides recur-rent, exponentially shaped voltage pulsessimulating the output of a gas-fillednuclear-particle counter tube. Pulse rateis adjustable from 1 to 15 per secondand voltage from 0 to 100 mv. (Auto-mation Dynamics Corp., Dept. 414)24 OCTOBER 1958

* VECTOR BRIDGE provides direct indica-tion of magnitude and phase-angle com-ponents of impedance from 60 cy/secto low radio frequency. Phase range is± 90 deg; impedance range is to 100,000ohm. Accuracy is better than ± 1 degfor phase angle and ± 1 percent for im-pedance. An accessory plotting devicepermits recording of points on rectangu-lar coordinate paper. (Harris Trans-ducer Corp., Dept. 419)

* LEAK DETECTOR of the helium mass-spectrometer type achieves fivefold in-crease of sensitivity over previous modelsby introduction of a butterfly valve be-

ELECTRONIC

Thermometer* Rapid, Accurate, Direct Reading* Low Cost, Portable, Thermistor Type* Many Ranges from - 35 to + 1000 C.* Interchangeable & Special Probes* Controllers & Recorders Available

COMPACT

Magnetic Stirrer* Stir at Any Angle* In Open or Closed Vessels* Under Vacuum or Pressure* With or without Hotplate

TEFLON

Tissue Homogenizers* Interchangeable Teflon Pestles* Precision Bore Pyrex Glass Tubes* Notched for Quick Change Chuck* Complete Apparatus Available

AUTOMATIC

Egg-Punch* For Opening Embryonated Eggs* Open 60 Eggs Per Minute* Clean, 1" Circular Fracture* One Hand Efficient Operation

tween the manifold and the diffusionpump. A leak rate of 2 x 10-1' atmoscm3/sec of helium will produce 5 per-cent of full reading. (Consolidated Elec-trodynamics Corp., Dept. 424)

* AMINO ACID ANALYZER combines ion-exchange chromatography with auto-matic colorimetry to perform quantita-tive analysis of mixtures of amino acids.The sample to be analyzed is passedthrough a variety of columns, and theeffluent stream is combined with a regu-lated flow of ninhydrin reagent. Theresulting mixture flows into a heated re-action vessel and thence into a photom-

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eter assembly. The latter measures ab-sorption at 440 and 570 mvt and performsa third absorption measurement with a

shortened light path to provide a widerange of sensitivities. Three separate ab-sorbance curves are printed in multi-color dots by a recorder. (Phoenix Pre-cision Instrument Co., Dept. 428)

* SCINTILLATION SCANNFR maps sites ofradioactive material in human bodies.Whole-body scanning is fully automaticand is recorded in scale of 1:4. Full-scale scanning can be performed of areas

560 by 420 mm. A wide variety of spac-

ings, scanning speeds, and scaling fac-tors is offered. (LKB Produktor Fab-riksaktiebolag, Dept. 415)

* PERFORATED-TAPE READER operates at

1000 characters per second. Reading isphotoelectric. Stopping time is slightlymore than 1 msec. The next characteris read with 5 msec of reinitiation of theread operation. The reel will hold 350or 700 ft of tape. Automatic rewind andend-of-tape sensing are provided. (Bur-roughs Corp., Dept. 430)

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* TENSILE TESTER consists of separateloading and recording sections for re-mote testing. Deformation rate is con-stant and continuously adjustable from4 to 4000 in./min. The instrument pro-duces a photographic record calibratedin terms of stress, strain, and time. Alle-gany Instrument Co., Inc., Dept. 416)

* TESTING MACHINE provides automaticsimulation of a wide range of stress andstrain at elevated temperatures. Capacityis zero to 50,000 lb. Temperature rangeextends beyond 3000'F. Ram rates upto ¾4 in./sec, temperature rises to 200'Fper second, and cycling rates of 10 persecond are possible. Variable-reluctancetransducers sense strain and load. Meas-urements are automatically recorded on,an 8'/2- by 11-in. graph. (MarquardtAircraft Co., Dept. 417)

* SOLID-STATE BATTERY has a potential of95v in 0.14 in3. It can supply 10-3 pafor 176,000 hr or a flash current of 20pta. Voltage per cell is 0.8, and configur-ations providing 95 v/in. and 625 v/in.3can be produced. Steady current persquare inch of cell area ranges from10-5 amp for 100 hr to 10-8 amp for anestimated period of 100,000 hr for a 10-percent voltage drop. Flash current of200 ,ua/in.2 is obtainable. Temperaturecoefficient is 1.2 x 10-3 v/deg v between-50° and + 50'C. (Universal WindingCo., Dept. 418)

* FRACTIONATION COMPUTER accepts elec-trical input signals from instrumenttransmitters installed in the fractionationprocess loop and performs computationdesigned to maintain product quality.Calculations are based on feed flow rateand product analysis. (Southwestern In-dustrial Electronics Co., Dept. 422)

* AIRBORNE-PARTICLE SAMPLER iS builtaround a turbine-type blower and has acapacity of 75 ft3/min. Flow is measuredby a self-contained variable-orifice meter.A variety of filters is available. (Nu-cleonic Corp. of America, Dept. 425)

* TEMPERATURE RECORDER has sensitivityand accuracy ±0.001°C on a full scaleof 0.5°C. The instrument combines athermistor sensing element and a strip-chart recorder. Any 0.50C portion of thetotal range 20° to 30CC may be selectedby a switch. Other ranges and multi-point measurement can be furnished.(Fenwal Electronics, Inc., Dept. 426)

* COOLING COIL is a refrigerated coil thatcan be immersed in liquid or placed ina cabinet as needed. A rolling cabinethouses the compressor and thermostat.A 5-foot, flexible extension hose couplesthe tinned-copper cooling coil, measur-ing 8 in. by 4'/2 in. in diameter, to thecabinet. Temperature control is main-

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CONTINUOUS CO2 ANALYZER

A simple CO2 Analyzer based on thecritical orifice principle.*

Specifications

Sample flow rate-100 cc./min.

Range-0 to approx. 10% C02Accuracy ± 0.05% CO2

Response time-2 to 3 min. forfinal reading

Vacuum requirement-simple wa-ter aspirator which reduces pres-sure to at least half atmospheric

Chemicals-Ascarite, Drierite andgauge oil supplied

The analyser is particularly suitedfor continuous analysis of both ex-pired gas and alveolar gas (e.g. asprovided by Rahn end-tidal sampler)in student physiology laboratories.The sampling rate is such that theunit can be used in series with aPauling oxygen analyzer.

*J. Mead. A critical orifice CO2analyzer suitable for student use.SCIENCE, Vol. 121, Pages 103-4,1955.

CO2 Analyzer, complete-$145.00F.O.B. Dover, Mass.

HARVARD APPARATUS CO.,INCORPORATED

Dover, Massachusetts, U.S.A.

(A nonprofit organization)

tained ± 20F from ambient to 50F. Atemperature probe inserted with the cool-ing coil controls the thermostat. Opera-tion is on 115 v a-c. (Andrew TechnicalSupply Co., Dept. 429)

* INDICATOR TUBE of numeral-electrodeneon-glow type is available with di-ameter of 3 in. Digital indication of thetube is said to be readable at distancesgreater than 150 ft. (Burroughs Corp.,Dept. 427)

* SHAFT-ANGLE DIGITIZER solves the prob-lem of centering of the measuring diskby taking the arithmetic average of twodial readings at diametrically oppositepoints. Readings are made by two photo-diodes counting two waveforms in-scribed on the disk. By counting the num-ber of crossings of the two waveforms,digital logic may be applied to followbidirectional rotation. (Dynamics Re-search Corp., Dept. 420)

* FREQUENCY-SELECTIVE VOLTMETER COV-ers the frequency range 1 to 400 kcy/sec.The instrument uses the heterodyne prin-ciple and crystal-filter selectivity. A 100-cy/sec-bandwidth filter and a 3-kcy/sec-bandwidth filter are provided. A direct-reading meter is calibrated from - 90 to+ 32 dbm with accuracy ± 0.5 db overthe instrument range. (Railway Commu-nications, Inc., Dept. 423)

* SCINTILLATION SPECTROMETER is an au-tomatic instrument that utilizes a stepdrive to advance the base line sequen-tially, 1 volt at a time, for up to 100channels. Counting time for each settingmay be from 0.5 to 8 min. Counts are ac-cumulated, and the total is recorded atthe end of the chosen period. Count in-tegration for the next channel starts assoon as the previous value has been resetto zero. (Baird-Atomic Inc., Dept. 431)

* CHLORIDE TITRATOR operates by react-ing chloride ions with electrochemicallyproduced silver ions. A constant directcurrent between a pair of silver elec-trodes provides silver ions until all chlo-ride has been reacted. At this point un-reacted silver ions cause an abrupt in-crease in conductivity, actuating a relayto interrupt the current and stop a timer.Elapsed time is proportional to chloridecontent. Titration time usually rangesfrom 5 to 60 sec. (American InstrumentCo., Inc., Dept. 432)

* POTENTIOSTAT maintains the potentialbetween an electrolyte and a test sampleconstant by monitoring the potentialwith a standard electrode. Potential isadjustable between 0 and + 2 v, and cur-rent is variable ±50 ma. (Shandon Sci-entific Co., Ltd., Dept. 449)

JOSHUA STERNNational Bureau of Standards

24 OCTOBER 1958

for work in acontrolledatmosphere

BLICKMANVACUUM DRY BOX

Designed for safe handling ofradio-isotopes, reactor fuel con-taining Plutonium or U233 andother hazardous substances. Withair-lock, it can be sealed to createa vacuum. Fabricated of stainlesssteel plate-34" long x 26" high x24" wide at base. Air-lock meas-ures 18" x 12". Send for Techni-cal Bulletin A-2.

FOR SAFE HANDLING OFRADIOACTIVE MATERIALS

BLECKMAN FUME HOODOriginally designed and (level-oped for the AEC. this FumeHood assures maximum safety inthe handling of radioactive ma-terials and radioactive isotopes.Sturdy 14-gauge stainless steel,round corner construction pro-vides long life ... easy cleaning anddecontamination. Send for Tech-nical Bulletin E-3. S. Blickman,Inc., 0910 Gregory Avenue. \Vee-hawken, N. J.

BLICKMANLABORATORY EQUIPMENT

Look for this symbol of quality

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EquipmentJOSHUA STERN

DOI: 10.1126/science.128.3330.1011 (3330), 1011-1013.128Science 

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