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• Gas Burners• Electric Heating Elements• Kiln Controllers• Glass Making Literature• Construction Papers

The Studio Workshop of Dudley Giberson

Warner, New Hampshire

Product Catalog2015

Joppa Glassworks,

Oct.

Written and Illustrated by Dudley F. Giberson, Jr.

© October, 2015Dudley F. Giberson, Jr., President

Joppa Glassworks, Inc.

8th Edition Printed, October of 2015by The Joppa Press86 East Joppa RoadWarner, N.H. 03278

Contact Information:Joppa Glassworks, Inc.

P.O. Box 202Warner, N.H. 03278Phone 603-456-3569

e-mail: <[email protected]>

All rights reserved. No part of the contents of this pamphlet may be reproduced

in any form, including electronic or traditional media,without the written permission of the publisher.

Be sure to visit our hot-link to the world

www.joppaglass.com

Joppa Product Catalog page 1

Table of ContentsGiberson Ceramic Burner Heads:

Choosing the right head, p. 2Proper installation, pp. 3-5Safety systems, pp. 6 & 7Venturies and other burner accessories available, p. 8-9Dudley’s garage burner for the Italian touch, p. 9Pipe warmer burner, p. 9Mini-Square Burners, p. 10

Elements and element accessories:General overview, electrifying your project, p. 11Installation methods, pp. 12

Grooved brick, p. 12Donut system, p. 12Ceramic rod suspension system, p. 12Donuts and ceramic rods, p. 13

How we name our elements, p. 14Sizes of our elements, p. 14Large fuser-slumper kilns, p. 15Price list of available elements, p. 16Ceramic insulator tubes, p. 17Marinite Connection Boards. p. 17

Construction Papers:Large Slumper/Caster Kilns, bottom p. 16How to build your own controller, p. 18 & 19

Controllers:Auber Kit # 1 & #2, p. 19Relays, p. 19

Foundry EquipmentTongs, pouring handles, skimmers and crucibles, p. 21

Joppa literature:A Glassblower’s Companion, p. 21

Charts of useful information:Orifice chart for gas flow, p. 22Drill size index, p. 22Weight of glass in pot chart, p. 23Insulation value and strength of materials, p. 23Watts per cubic foot of kiln space, p. 23

Resource list:Where to get other things– books to tools, p. 20

Order form: p. 24Price list:

List of many of the Joppa Glassworks products, p. 25

Traditional 4"Giberson Head 2.5” Mini-Square

Giberson Head 2” Mini-Square Giberson Head

The Giberson Ceramic Burner Heads Come in Three Basic Shapes:

The Traditional 4" Round (6 Hole Sizes)The 2.5" Mini-Square (2 Hole Sizes)

The 2" Mini-Square (2 Hole Sizes)

Suggested Uses for the Giberson Ceramic Burner Heads:• Glassmaking

° Glass Melting Pot Furnaces° Glass Melting Day Tanks° Glory Holes° Gas Annealing Ovens

• Pottery Kilns° Salt Kilns° High Temperature Ceramic Kilns

• Foundry Furnaces• Blacksmith Forges & Other Heating Devices


24Plus one lg. ctr. hole

9/32"5/8"B-650

large glories (16” to 18"), day tank furnaces (to 300 lbs.), salt kilns, & forges

24 9/32"B-255 day tank furnaces (200 lbs.) & medium glories (11” to 15”)

17/64"24B-250day tank furnaces (100 lbs.), investedpot furnaces (150 lbs), glories (9” to 11”), freestanding pot furnaces (200 lbs.)

1/4"24B-250S small to medium glories (1 cubic foot, with 8” door), medium pot furnaces, etc.

7/32"24B-7/32 pot furnaces & various multiple burner applications

3/16"24B-3/16 for small glories and furnaces (25 to 35 lbs.), pipe warmers, bead furnaces, & gas annealing kilns

Tradit

ional G

iberso

n Rou

nd Bu

rners

New

Mini-

Squa

re

7/32"18SQ 2.57/32

for small foundry furnaces and glass furnaces (10 lb) small 5-6" glories

3/16"18SQ 2.53/16

for small furnaces and annealers,furnaces (5 lb) small 4-5" glories

7/32"13SQ 27/32

for small foundry furnaces and glass furnaces (5 lb) small 4-5" glories

3/16"13SQ 23/16

for mini-glories and furnaces (5 Tto 10 lbs.), pipe warmers, bead furnaces, & gas annealing kilns

Orificefor HP

Propane

75

72

73

69

65

60

59

58

57

56

Model Various Uses No. of Holes Hole SizeBtu Range(1000s)

Forced AirBtu Range

(1000s)

Venturi Mix

54-195

46-150

44-120

41-99

39-95

30-75

13-52

9-39

10-40

6-28

30-68

13-47

9-31

10-34

6-24

39-88

41-93

44-98

46-103

54-120

Nat. GasHP Propane

If you would like help makingsense of the many choices,please call Dudley 603-456-3569for a free consultation.

The Proper Installation of the Giberson Head and the best burner port design to match the Giberson Head

Here follows several design ideas about how to get good life out of your GibersonCeramic Burner Head. Two to three years is the average life, but I have a Giberson tip in myglory hole which is 25 years old and many people have burners that typically last ten years,outlasting several furnaces or glories!

Please note that I promise only two things. First, the burner you buy today was per-sonally cast by me. By this I mean I make them with my own hands, the same as I did 35 yearsago. And second, sooner or later the head will break. Some people will drop it and break it onopening the package. Others have broken them by hammering on the pipe work, brand new.(Don't do that!) Still others get burner "pop-back" or "burn-back" on the initial firingbecause they don't understand what "pop-back" is. “Pop-back” is when the flame is burn-ing in the head, not in front of the head. And with this condition in place, they turn up thegas and ruin the head. For a page of good color graphics concerning this problem, go tohttp://www.joppaglass.com/burner/pop_back.html (and if this explanation is insufficient, give Dudley a call).

However, 95% of the installations go along with none of the hair-pulling problemsjust suggested. Having a trouble-free site is our primary aim. Please look over and study thefollowing material. If you follow the suggestions offered, you will have the best chance fora trouble free studio.

If you are not sure of type of fuel (i.e., high or low pressure gas) or type of mixer touse, please visit this site which specifically addresses these issues:

<http://www.joppaglass.com/burner/choice.html>.

AWORSE CASE SCENARIOWe begin by showing the worst case scenario. This is a situation which has killed

many a good Giberson head. The Giberson Ceramic Head is not made out of a super "god"material. It is subject to expansion and contraction. And just like crucibles, sooner or later theGiberson Ceramic Burner Head will crack and need replacement. But this is a sure killer– thenarrow, long burner port shown below:

This straight burner port cracksheads because of the intense and rapidheat that builds up. The only situationworst than this is the "all-frax" burner port.It is general practice to turn on aglory hole and expect to be atworking temperature within 30-45minutes, maybe an hour. But an allfrax glory can get to temperature in 20minutes. If the burner port is made of fraxand is long, like our example here, thenwe get this rapid and intense heat buildup just in front of the head which occurswithin a couple of minutes. That's too hot, too fast! And that spells "trouble!" So with this"bad" idea on the page, let's explore some other ideas that promote burner head longevity.

HotCombustion

Chamber

The world's worst BURNERBLOCK

In the narrow port, a tremendous heat

builds up fast.



4 "

1-1/2"FemalePipeFitting

3 "

3.5 "

Tuck a small strip of Fiberfrax (1/2" wide x 14" long) in this cavity as a flexible gasket. Wet the Fiberfrax with cup of water and a teaspoon of mortar. This will softly adhere when fired.

4.5"

5.0 "

Angle the Burner Block 12˚ to

reflect the heat toward the

combustion chamber

SIGHTTUBE

Checklist for a Good Burner Head Installation1. The burner head is 4" in diameter and the burner block (port)

should be 4-1/2" in diameter. This leaves a 1/4" space on allsides of the head.

2. Place the front of the head about 1/2”- 3/4” into the burnerport.

3. The burner head is designed to be sealed into the burner block(port). To seal the head into the port, I use a piece of frax thatis 1/2" square X 14" long. Soak the frax strip in water andapply about one tsp. of Sairset mortar to the frax strip. In thiswet condition the frax will compress and pack in the smallspace between the head and burner port. This gasket will besomewhat flexible even after the mortar hardens.

4. Do not cover the head with Fiberfrax or any insulation prod-uct. The head needs to be exposed to the cool air.

5. If the burner block combustion channel is more than 3”long infront of the burner head, angle the sides of the combustionchannel to reflect the heat toward the combustion chamber.


CoolAir

CoolAir

MiddleInsulation

BurnerBlock (Port)

Burner Block

OuterInsulation

HardLiner

SightTube

On a narrow, thin-walled installa-tion such as this glory hole in abarrel, the burner block can beextended outward to accommo-date the necessary design ele-ments. Here in the space in frontof the burner head there is apocket at least 3" deep to help theflame seat properly. This is alsothe UV sight target (about 3-4" infront of the head). The site tubeshould focus on this spot.

Extend burner port outward.This will create essential3" pocket inside theburner block.

3"

Burner Block

SightTube

On a thick-walled furnace structure(greater than 6” thick), it is desirableto inset the burner block as shownhere. This eliminates most of theproblems associated with a longnarrow burner port and allows amajority of the heat to move easilyinto the combustion chamber. It alsomakes the burner head less obtru-sive (sticks out less).

Typical Glory Hole Installation

Installation of burner in thick-walled furnace

If you have any questions please callDudley Giberson (603) 456-3569

Note: For a complete explanation of how to make this typeburner port, refer to pp. 44 of A Glassblower’s Companion.


# Product Description Vendor Approximate Cost1 FM solenoid (ASCO) Abell Combustion $420.00 2 Gas cock Abell Combustion $38.003 Pressure gauge (for low pressure) Abell Combustion $78.004 UV monitor & relay (manual start) Abell Combustion $787.005 Dayton blower #1TDP5 WW Grainger $95.006 Giberson Ceramic Burner Joppa Glass $175.007 Burner block homemade $20.008 UV Scanner Abell Combustion $139.009 Main electric switch local store $15.0010 Low limit pressure switch Abell Combustion $130.0011 High limit pressure switch Abell Combustion $130.00

Total of listed items $1607.00

Schematic for Low Pressure Gas SafetySystem (Propane or Natural Gas)

1. FMsolenoid

2. Gas cock

3. Pressuregauge

Gas Supply

7. Burnerblock

6. GibersonCeramic

Head

5. Dayton Blower#1TDP5 or other airsource

120 Volts

4. "UV"monitor& relay

11. HighPressureSwitch

10. Lowpressureswitch

8. "UV" sensor& magnifier 9. Main

electricswitch

FreshAir In

WeldOrifice Cap


Schematic for High Pressure PropaneSafety System

Before choosing this system, please read about the difficulties ofgetting this system passed by your friendly gas inspector. Thissubject is covered in detail at our web site: http://www.joppa-glass.com/burner/comp_son.html and it is discussed in AGlassblower’s Companion, p. 120.

# Product Description Vendor Approximate Cost1 Baso valve (H19RA-2) Joppa Glass $175.00 2 Thermocouple (JC-TC48) Joppa Glass $20.003 Pilot light (B1S) Joppa Glass $188.00(SEE URL: http://www.joppaglass.com/burner/pilot.html for “how to” instructions)4 (2) Needle valves ($20.00 ea) Joppa Glass $40.005 Gauge (0-30 psi) Joppa Glass $16.006 Ransome Venturi 1-1/2" Joppa Glass $130.007 Giberson Ceramic Head Joppa Glass $175.008 Burner block homemade $20.00

Total of listed items $764.00

At Joppa Glass we sell the high pressure safety equipment shown on this page. Others alsosell this equipment as well as the safety systems for low pressure systems shown on the oppo-site page (6). Here are the names of a few firms that are willing to assist you in your choices ofsafety equipment:

Abell Combustion Co, Inc, P. O. Box 198, Kimberton PA 19442 (610-827-9137)HUB, John Chiles, 690 Route 73, Orwell, Vt. 05760 (802-948-2209)Meeder Equip/ Ransome MFG, P. O. Box 12446, Fresno, CA 93777-2446 (559-485-0979)

"ALFRED STYLE MIXER"1-1/2" NPT "TEE"3/8" X 6" NIPPLE

3/8" CAP w. ORIFICE 1-1/2" x 6" NIPPLE

1-1/2" X 1/2" REDUCERWELD JOB AND

ASSEMBLY= $99.00

DAYTON BLOWER W BAFFLE $238.00ALFRED MIXER $99.00GIBERSON BURNER HEAD $175.00TOTAL FOR COMPLETE KIT $512.00

GIBERSON CERAMICBURNER HEADS

ALL STANDARD SIZES $175.00 ea.

DAYTON 1TDP5 BLOWER, with AIR BAFFLE, 1-1/2" FLANGE, Power Cord, Switch.. $238.00

Alfred Style Gas/Air Mixer for Low PressureNatural Gas or Propane

AIR

GAS

Customer provides all parts not shown, i. e., component connections as air pipe, gas gauges, ball valves, etc. Safety system not provided.


Over the years Joppa Glassworks, Inc., has pro-moted only one kind of venturi, the RansomeVenturi. The reason is the Ransome prod-ucts are very well made, efficient, and costeffective. We offer these venturies to ourcustomers for use with our burnerheads and accessories. These ven-turies can be used over a wide gaspressure range with multiple gasusages. If you have any ques-tions please contact DudleyGiberson.

Ransome V150 $130.00



Ransome V050 $87.50

RANSOME CAST IRON VENTURIESA SIMPLE, HIGH QUALITY PRODUCT


0-30 P.S.I. Gauge(1/4" NPT) $16.00

All Brass (1/4" NPT) Needle Valve(High Quality)$20.00

Ransome V150Venturi $130.00

Our High Pressure Kit includes burner head, venturi, needle valve, and gaugSee below for correct Head Size/Orifice Size to fit your BTU needs.

Complete Kit$325.00

Note:Customer providesconnecting parts

$175.00

GibersonCeramicBurner Head

High Quality1/4" NPT Brass Needle

Valve $20.00 ea.0-30 psi Gauge, 1/4" NPT

$16.00

Our standard gas pressure gauge is for High Pressure Propane. 0-30 PSI. We sell only a glass faced gauge so this will proform well (not melt) in ambient temperatures that are typical near burners. (But please keep below 200˚F)

High quality needle valve, all brass construction. These are capable of making the finest of adjustments.

Joppa Glassworks High Pressure Propane Burner System

Dudley’s Garage Burner:All Gasses: this burner runs steady from 5,000 Btu's to 41,000 Btu'sDoes not need forced air. Use with venturi #V125. Orifices with Gas Chart:High Pressure Propane Use #60 orifice up to 5 psi Low Pressure Propane Use #48 orifice 11" w.c.Low Pressure Natural Gas Use #35 orifice 7" w.c.

Or purchase complete Garage package for $278.50. Package includes Burner Head with Venturi (V125), 1-1/4 union coupling,needle valve, and a complete drawing of the Garage. A great deal at this modest price.

All Metal Head$145.00

Purchase as a singleitem or in a kit as

shown below

Here is our solution for a great pipe warmer. Works on eitherNatural Gas or Propane. Construction Kit includes complete

burner as shown in diagram and instructions forcompleting your own Pipe Warmer.

These burner parts may be pur-chased as parts or as a completegroup. The metal ribbon burner headpurchased alone costs $135.00 and thegreat little bell venturi, V050, is $87.50.

As ShownReady to Go

$249.50Complete Ribbon

Burnerfor Pipe Warmer

Kit includes:Ribbon Burner Head,Elbow, 1/2" Nipple,Venturi V050, Reducer Coupling, and Needle valve– Plus Instructions

15"

$249.50Complete Kit

Low PressureNatural Gas 6" WC #48 OrificeLow PressurePropane 8"-11" WC #54 OrificeHigh PressurePropane 1-2 psi #65 OrificeYou will not need much pressure.Use needle valve to modulate gas flow.

Pipe Warmer Orifice Chart

The Joppa Glassworks Pipe Warmer


info: wwwjoppaglass.com/burner/mini_square.html2" Mini-Square = $115.00 2.5" Mini-Square = $135.00

2"2.5"

The Mini-Square Burner SeriesThese burners are terrific formaking that small glory,pot furnace or Mini Forge. Great fora small foundry fur-nace which can burn for many hourson a small tank of propane. Same propertiesas the standard GibersonCeramic Heads.

ANNEALING KILNS

CASTING KILNS

SLUMPING KILNS

POTTERY KILNS

BIT BOXES

At Joppa Glass we wind all of our elements to your cus-tom specifications. If you are not sure of what you want, pleasecall Dudley at (603) 456-3569 for a free consultation.

When ordering elements please have this informationhandy:• What your kiln is made of, i.e., soft brick, frax or the like.• The temperature you plan to achieve.• The dimensions of your kiln, which include the following:

1. Inner kiln dimensions2. Wall thickness and materials used3. Crown thickness and material used4. Floor thickness and construction5. Door size and location

Please read “Dudley’s Element Paper” for a rather complete set of directionsfor working with electric elements: Methods of installation, wiring diagrams,etc. Please view our element section at <www.joppaglass.com/elements/>.



Three Basic Element Installation Methods:The Grooved Brick Technique:The grooved brick technique is the traditional method of installing elements in soft brick kiln. Advantages:1. Relatively shock proof. The element is not exposed2. Mostly Student resistant. (Nothing is student proof.)3. Easy installation.4. Heavy duty, long oven life. You will tire of the oven long before

it wears out as its life expectancy is 25-30 years.5. Heat retention. The oven has lots of mass so if the door is

opened, it will not chill as quickly as would a fiber insulatedoven.

6. Wide heat use. This oven can be used over a wide temperaturerange: annealing at the low end (950°F), glass casting in the mid-dle range (1600°F), and high fired ceramics on the top end (2200°F).

Disadvantages:1. Dinosaur construction. It is heavy and hard to move. 2. More expensive to operate. Costs more to heat up and operate than does an all fiber model. In order to

anneal glass at 950°F you first have to heat all the bricks to 950°F. Over the life of the oven this couldmean a lot of money, perhaps thousands of dollars.

3. This kiln design takes longer to heat up, a time and cost issue.

GROOVED BRICK CONSTRUCTION

GROOVED SLOTWITH ELEMENT

INSIDE NICHE

IFB

The Donut System:The simple "Donut System" is best used in annealing kilns(not to exceed 1150°F) along vertical walls. It is normallyused with the all-frax kiln wall, though it can be used with(IFB) brick kiln construction. The ceramic insulators,"donuts," are normally placed one above the other as shownin the illustration to the right. They should be spaced aboutevery 6” to 8” horizontally. Some natural slump of the ele-ments will occur without any problems, i.e., though the ele-ments will sag a little they will not short out and will beelectrically secure. The elements simply hang in tandem. Please note this type of installa-tion is used for annealing situations only. For temperatures above 1150˚F we recommendusing the grooved brick construction discussed above, or use our Ceramic Rod SuspensionSystem shown below.

The “donut” is a disc shaped ceramic washer that looks like this:

The Ceramic Rod Suspension System:To completely control the placement of yourelements we recommend the ceramic rodsuspension system. The ceramic rod pro-vides internal support for your elementswhile the “donut” insulators hold every-thing in place. We recommend this systemespecially for overhead placement (as inslumpers and fusers) or for other importantsituations where you don’t want the ele-ment to move one iota from its location.

LOW HIGH

2

3

4 5

6

7

LOW HIGH

2

3

4 5

6

7

SectionView: Overhead Element Installation

Pyrometer


1/2" Cordierite Rod3/8" Cordierite Rod

1/4" Mulite Rod

The Joppa Glassworks “Donut” SystemIn recent years we have introduced several new products for supporting

elements in kilns. We have new larger rods at 3/8” and 1/2” in diameter andmatching donuts that are rather stout. The larger systems can support larger,heavier gauge element material. Another big advantage is the larger rod structurecan sustain a condensed smaller gauge element in a relatively small space. Inother words, because of the larger diameter, the element needs less length tostretch out.

An element suspended in mid air:

To match our ceramic rods we have the followingdonut insulators. These fit over the element and sup-porting rod. The #7 & #8 Donuts are for use with 15and 16 gauge elements on both 3/8” and 1/2” rods.

Size Donut Name Donut ID x OD Cost1/4" #5 Mulite Donut 0.45" x 0.78" .753/8" #7 Cordierite Donut 0.560" x 1.000" 1.951/2" #8 Cordierite Donut 0.680" x 1.165" 2.15

All rods are30 inches long.

#8 DonutCordieriteID=0.680"OD=1.165"Cost $2.15

#7 DonutCordieriteID=0.560"OD=1.000"Cost $1.95

#5 DonutMulite

ID=0.450"OD=0.780Cost $.75

#2 DonutMulite

ID=0.3125"OD=0.550"Cost $2.00

#1 DonutAlumina

ID=0.250"OD=0.375"Cost $2.00

Our “Donut” Collection


E 240 14 16 6Prefix Voltage Amps Wire

GaugeArborSize

How We Name Our Elements

Arbor

Element Wire

Diameter of Coil

Element Coil,a.k.a. "The Element"

ElementArbor Size

Inside Diameterof Element

(before stretch)

ApproximateOutside Diameter

of Element

Used withWire Diameter

How element is

6

8

7

5

4

3

.375 .500 15, 16, & 18

14, 15, & 16

14, 15, & 16

Grooved BrickConstruction

.3125 .375Sometimes 15,Usually 16,

& 18

Donut System& With 1/4"Mulite Rods

.250 16, 18, 20& 22

16, 18, 20& 22

SometimesHung on Fused

Quartz Rods

.1875 .250

Mini ElementsSupported on Fused

Silica Rods

Generally Used

.405 .525

.540 .655#8 DonutsWith 1/2"

Cordierite Rods

#7 DonutsWith 3/8"

Cordierite Rods

.3125

Used insideQuarts Tubing to make protected

elements.

The Element's Shape • The "arbor" forms the inside diameter of the element.• The outside diameter is equal to the thickness of the "arbor" plus two diame-ters of the raw wire.

In recent years there has been a great interest in large fusingand slumping kilns. We have our components in perhaps 150 ofthese kilns, some as large as 350 cubic feet. So we have a good dealof experience and can help guide you with our expertise. The largerods and donuts combined with expertly wound elements providethe successful combination to make your project a reality at a frac-tion of the cost of a store bought model.

We can help with all facets of design from 3-D CAD draw-ings to design critique, electrical schematics to controllers. But typ-ically our customers already know what they want. And they cometo us for elements and element components.

The Large Fusing and/or Slumping Kiln:

The Big Kilns:

Large lift top fusing kiln

Busbar Construction

for Single PhaseConstruction



If you are a glassblower, slumper, fuser, beadmaker, caster, etc., we can help you get upand going. If you are interested in learning more about kiln design and the art of electrifying yourkiln, perhaps you would enjoy reading about how to build kilns in Dudley's book, A Glassblower's Companion. Five chapters are devoted to building annealers ofall sizes, from the very small to the very large. If you are interested in build-ing a big slumper/caster please order Dudley’s new ConstructionPaper #5, “Large Slumper/Caster Kilns,” (now $15.00). This containsplans and guidelines for building an array of sizeable kilns. We havehelped many people build these large monsters. This document isdesigned to help you navigate the pitfalls of big kiln construction.We wish you to have a successful kiln building experience.

Element Name Volts Amps Watts Wire Comments PricePlace "Arbor" Size Gaugein the "( )" belowE240-14-16( ) 240 14 3360 16 Standard Element 42.00E240-14-15( ) 240 14 3360 15 Heavy Duty 45.00E208-14-16( ) 208 14 2912 16 Standard Duty 42.00E208-14-15( ) 208 14 2912 15 Heavy Duty 45.00E240-12-16( ) 240 12 2880 16 Longer Lasting 45.00E240-12-15( ) 240 12 2880 15 Very Heavy Duty 50.00E208-12-16( ) 208 12 2496 16 Standard Duty 43.50E208-12-15( ) 208 12 2496 15 Super Duty 45.00E240-10-18( ) 240 10 2400 18 For Pick-up Ovens 40.00E240-10-16( ) 240 10 2400 16 Longer Lasting 52.50E240-08-18( ) 240 8 1920 18 Medium Duty 45.00E240-08-16( ) 240 8 1920 16 Longer Lasting 58.00E240-05-20( ) 240 5 1200 20 Medium Duty 32.50E120-14-16( ) 120 14 1680 16 Standard Duty 25.00E120-12-16( ) 120 12 1440 16 Standard Duty 27.50E120-10-16( ) 120 10 1200 16 Long Lasting 30.00E120-08-18( ) 120 8 960 18 Medium Duty 26.00E120-06-20( ) 120 6.25 750 20 Bead Kiln Element 25.00E120-05-22( ) 120 5 600 22 Sm. Heater Kiln 25.00

At Joppa Glassworks, Inc. we stock several kinds of element wire, specifically“Kanthal” type in several gauge sizes (22, 20, 18, 16, 15, &14) and “Nichrome” type in 17gauge. We make all elements to order. Are you in a hurry? Please let us know and we will tryto get your order out that day.

The name of the element you order has a structure that holds information (see page14). The last number that goes in the bracket stands for the arbor size. We wind elements on6 different arbor sizes coded 8, 7, 6, 5, 4, & 3, so that number goes in the “( )” below. To orderelements, call Dudley for a free consultation (603-456-3569). Have your kiln specs handy (ref-erence page 11). The prices of our elements have changed very little over the years. We don’tlist every model we make as there are many variants. We list this sampling of elements to giveyou a specific idea of our prices.

I am more than happy to discuss why you would want one type of element overanother. There are many issues that effect choice of element configuration, such as amount ofstretch, kiln size, what the kiln is made of, maximum working temperature, etc. A wellmatched element should last for years.

ALL PRICES SUBJECT TO CHANGE , WITHOUT NOTICE

ELEMENT PRICE LIST


Marinite Panel

Element in groove

GroundedPlug

RED

BLACK

GR

EE

N

Power Switch

Support Bracket

Ceramic Insulator Tube

Metal Kiln Shell

Nut and Bolt Stack

Double Twist Element Lead

Kiln Wall Insulation

Romex Connector

Ground Your Frame

Electrical Housing

Cover

Our Standard Ceramic LeadTube Insulator , sometimes called a“Wall Tube,” is made of unglazedcordierite. This useful item insulatesthe element leads as they go throughthe kiln wall. The standard length is3-1/2” as shown for $6.00 each.These can be made longer or shorterfor your pleasure (cost varies).

Connector Boards:We offer this marinite material for building your electrical connection boards.We recommend this method for connecting your element leads to your power supply. We sell Marinite Board in two sizes:6” x 12” x 1/2” ($14.00) and 4” x 4” x 1/2” ($5.00)

Ceramic Insulator TubesThese tubes insulate the element leads as they pass

through the metal kiln shell and wall.

Ø 0.50"

Ø 0.25"

Ø 1

.00"

3.50

"

0.50

"

Standard 3.5" Lead Tubea.k.a. "Wall Tube"or "Thru-Tube"

$6.00 ea.

The Auber controller kit can be mounted inseveral configurations to suit your needs. Thistriangular desktop design fits low on theworktable where space may be limited orthe components can be built into a controlcabinet near the kiln site. Various options

are explored in the construction paper.


The schematic shown below is a typical plan for controlling a powerful kiln. Various wiring diagrams areoffered in Construction Paper #3, “How to Build Your Own Controller, Vers. 3.5.2” $15. This construction papercomes free with the purchase of any of the Auber controller modules.

120 VAC

120 VAC

120 VAC

120 VAC

Gro

und

Line

Type "K" Thermocouple

240 VAC60 AMP

Power Supply

120 VAC15 AMP

Power Supplyfor Controller

with Ground Line

Ground Kiln Shell

Use #4 GaugeSupply Line

Neutral

Neutral

Neutral

Neutral

-

1

2

3

4

5

6

7

8

9

10

13 14

ControllerON/OFF

+

KilnController

Mercury Relay

60 AMPFUSE

6" x 6" x 6" Euro Box Housing Shell

Schematic of Component Parts NOT TO SCALE

Fuse 1/2 Amp

Auber SYL-2372P

Use Grounded

Plug

Wiring Diagramfor Auber 2372P Controller

Relay 6-7 is an internal SSR and is factory limited to 3 amps maximum. I prefer to limit this to 1/2 Amp as this is plenty of power for this circuit shown.

Here in the image to the right is the way I buildmost of my controllers in a 6” x 6” x 6” Euro Box. Thismakes a terrific controller shell. All the components areplaced onto a piece of 6” x 12” aluminum sheet (18 ga.thick) bent at 90 degrees. This aluminum componentboard is then screwed onto the 6” x 6” x 6” box whichprotects all the parts, a very simple control box solution.

Our Mercury Relays- (We try to keep these in stock)MFG Product No. Coil Amps CostMDI 235NO-120A-18 120Vac 35 Amps 100.00Durakool 2035A120AC 120Vac 35 Amps 140.00MDI 260NO-120A-18 120Vac 60 Amps 130.00Durakool 2060APS120AC 120Vac 60 Amps 160.00

Made in USAAll prices are subject to change without notice. Other sizes Available.

Joppa Glassworks sells two very cool controller modules that are very afford-able, reliable, and provide many fine features for your kiln controlling needs.

OUR AUBER KIT #2372P– 30 Ramp and Soak Auber Digital controller, 1/16DIN, (85-240 VOLTS) which sends a control signal (120 VAC) to your main kiln mercuryrelay. Kit includes a type K thermocouple 36" and Dudley’s instruction guide, “How toBuild Your Own Controller, Vers. 3.5.2” a 21 page essay with pictures and diagrams tohelp you succeed, all for $165.00.

OUR AUBER KIT #2372– A simple set point controller, basically the same asabove but without the ramp and soak feature. Comes with a type K thermocouple 36"with Dudley’s instruction guide, “How to Build Your Own Controller, Vers. 3.5.2” withpictures and diagrams to help you succeed. $150.00.

Both of the above models have internal SSRs which limit the output signal to 3amps. The great thing about this is the control signal can be 24 VAC, 12 VDC, or 120 VACwhich is the most common. What you put in is what you get out.

For heavy duty we sell Mercury relays:


HOW TO BUILD YOUR OWN CONTROLLER

Mercury Relay

Another option for a medium duty situation is touse a mechanical relay to mate the Auber 2372P above,called a #T92S11A-120AC rated for 30 amps at 240 VAC andwill work for 120 VAC. This has a 120 VAC coil and costs$35.00. This is a good choice for controlling a bead kiln or acolor box. If you are powering something more beefy wecan suggest a heavy duty relay- prices on request.

And for those who prefer the SSR solution westill sell the 25 amp SSR for $35.00. This should bemated with a heat sink shown on the left. The combi-nation heat sink and relay sell as a kit for $70.00 whichincludes heat transfer paste and mounting screws.This relay should be powered by the Auber Syl-2352Por Syl-2352 controller module which puts out a 12VDC control signal which turns the SSR on and off. Ifyou chose the SSR solution pay close attention to con-struction of the heat dissipation system as the better

this works the more trouble free will be your kiln controlling experience. I rec-ommend using a small computer fan to blow air onto the heat sink. If you keepthis SSR cool and not overload it, this is the best of all solutions- quiet and effi-cient, and you can have cycle times low to minimize temperature drift.

Mechanical RelayT92S11A22-120AC $35.00

SSR and Heat SinkThe SSR goes on the inside

of the control box.


Resource ListBlowers:

W.W. Grainger Co. (1-800-473-3473)Abell Combustion Co, Inc, P. O. Box 198, Kimberton PA 19442 (610-827-9137)

Blowpipes And Glass Hand Tools:John Chiles, HUB Consolidated, Inc., 690 Route 73, Orwell, Vt. 05760 (802-948-2209)Fred Metz, Spiral Arts, 430 South 96th St # 5, Seattle WA 98108 (206-768-9765)Jim Moore Tools, P. O. Box 1151 Port Townsend, WA 98368 (ph. 360-379-2936) Putsch, P. O. Box 5128, Asheville, NC 28813 (1-800-847-8427) [email protected] Industries, Inc., 1507 Franklin Ave., Kent, OH 44240 (1-800-727-7473)

Books:Giberson, Dudley, A Glassblower’s Companion, 1st ed. P.O. Box 202, Warner, NH 03278 (603-456-3569)Grose, David, The Toledo Museum of Art Early Ancient Glass, Hudson Hills Press, New York, 1989Halem, Henry, Glass Notes, Reference For The Glass Artist, Ver. 4.0, Franklin Mills Press (330-673-8632)Schmidt, Edward, Ed’s Big Handbook of Glassblowing, Glass Mtn. Press, 1993. 927 Yew St, Bellingham, WA 98226 (1-360-733-3497)Schmidt, Edward, Advanced Glassworking Techniques, Glass Mtn. Press, 1997. 927 Yew St, Bellingham, WA 98226 (1-360-733-3497)Scholes, Samuel, Modern Glass Practice, C B I Publishing Co., Boston, 1952,. 51 Sleeper St., Boston, MA 02210Stern, E. Marianne, and Birgit Schlick-Nolte, Early Glass Of The Ancient World -1600 b.c.-50 a.d., Verlag Gerd Hatje, Stuttgart, 1994. Tait, Hugh, ed., Glass - 5000 Years, Harry N. Abrams, Inc., Publishers, New York 1991.Weyl, W. A., Coloured Glasses, Society Of Glass Technology, Sheffield, 1976., Thornton, 20 Hallam Gate Rd., Sheffield,S10-5B7, UK

Burners: Giberson Ceramic Burner Heads: Joppa Glassworks, P. O. Box 202, Warner, NH 03278 (603-456-3569)

Controlling Pyrometers:Bartlett Controllers, 1404 Avenue M, Po Box 445, Fort Madison, Ia 52627, 319-372-8366 (Bartinst.com)Digitry Company, Inc., 188 State Street, Suite 21, Portland, ME 04101 207-774-0300 www.digitry.comJoppa Glassworks, Inc., PO Box 202, Warner, NH 03278 603-456-3569 www.joppaglass.com (Auber Controllers)Omega , P. O. Box 4047, Stanford, CT 06907 (203-322-1666) www.omega.comInstrumart, 35 Green Mountain Dr, S Burlington, VT 05403 (800-884-4967) (Fuji Controllers) [email protected]

Crucibles:Engineered Ceramics, 24 West End Drive, (mail) PO Box 365, Gilberts, IL 60136 (847-428-4455 or 1-800-756-8794)High Temp Ceramics, Portland Oregon: dist: Guadalupe Glass, 354 Washington Hill Rd., Chocorua NH 03817 603-323-7900Emhart Crucibles, PO Box 580, Owensville, MO 65066 (573-437-2132 or 1-800-243-0048)

Cullet/ BatchSpectrum Glass Company, Inc. PO Box 646 Woodinville, WA 98072 425-483-6699 Spruce Pine Batch Co., P.O. Box 159, 2490 Burnsville Highway (19E), Spruce Pine, NC, 28777 828-765-9876

Diamond Abrasives:Eastwind Lapidary, Doug Klein, P. O. Box 302, Windsor, VT 05089 (802-674-5427)HIS Glassworks, Inc., Robert Stephan, 91 Webb Cove Rd., Asheville, NC 28804 (828-254-2559)Wale Apparatus, (attn: Mike) 400 Front Street, Hellertown, PA 18055 (610-838-7047)

Elements, Kiln Heating Elements:Joppa Glassworks, P. O Box 202, Warner, NH 03278 (603-456-3569)

Gloves, Glasses, & Torches: Wale Apparatus, (attn: Mike) 400 Front Street, Hellertown, PA 18055 (610-838-7047)

Magazines:The Glass Art Society Journal, Glass Art Society, 3131 Western Avenue, Suite 414, Seattle, WA 98121, Tel: 206-382-1305

Materials and Supplies: Glass Making Supplies (like metal oxides and other chemicals):Ceramic Color And Chemical Co., P. O. Box 297, New Brighton, PA 15066 (724-846-4000)McMaster-Carr E-Mail: <[email protected]> 200 New Canton Way, Robbinsville, NJ 08691-2343 (609) 689-3000U. S. Pigment, 815 Schneider Drive, South Elgin, IL 60177 (630-893-9217)

Refractory Products, Casting Products (Colloidal Silica):Ransome and Randolph, 3535 Briarfield Blvd., Maumee, OH 43537 (800)253-4502 or(419)865-9497

Refractory Products: (First look up “Refractory Products” in your Yellow Pages for a local source.)HUB, John Chiles, 690 Route 73, Orwell, Vt. 05760 (802-948-2209)Guadalupe Glass, 354 Washington Hill Rd., Chocorua NH 03817 603-323-7900Harbison Walker Refractories, 163 Boston Post Road, West Haven, Ct. 06516

Safety Equipment, High Pressure Propane Baso Valves and Pilot Burners:Joppa Glassworks, P. O Box 202, Warner, NH 03278 (603-456-3569)

Safety Equipment, For Low Pressure Gases “UV” Stuff:Abell Combustion Co, Inc, P. O. Box 198, Kimberton PA 19442 (610-827-9137)HUB, John Chiles, 690 Route 73, Orwell, Vt. 05760 (802-948-2209)Meeder Equip/ Ransome MFG, P. O. Box 12446, Fresno, CA 93777-2446 (559-485-0979)

Schools: for an endless list go to: <http://www.glassart.org/Schools_Glass_Education.html> For my own recommendation see below:Summer Schools, a great way to get introduced to glassmaking:

Haystack Mt. School Of Craft, Deer Isle, ME 04627 Penland School, P. O. Box 266, Penland, NC 28765 Pilchuck School, 1201 316th Av N.W., Stanwood, WA 98292 Red Deer College, Box 5005, Red Deer, AB T4N 5H5, Canada

Winter Schools with Glass Departments-Here are a few I like:Rhode Island School of Design, 2 College St., Providence, RI 02903 Mass. College Of Art, 621 Huntington Av., Boston, MA 02115Rochester Institute of Technology, One Lomb Memorial Drive, Rochester, NY 14623

Venturi Burners:Meeder Equip/ Ransome MFG, P. O. Box 12446, Fresno, CA 93777-2446 (559-485-0979)Joppa Glassworks, P. O. Box 202, Warner, NH 03278 (603-456-3569)


A Glassblower’s Companion is about Giberson's views onglass technology. The book is 136 pages, indexed, with over 300excellent illustrations showing how to build and maintain a widevariety of glass making equipment including ten glass melting fur-naces, five glory holes, five annealers (including fuser-slumpers),and five accessory pieces of studio equipment. It is a must for any-one serious about glass blowing and maintaining a glass makingstudio.

The material is presented as a collection of essays whichfocus on the underlying philosophy of hot glass. It is a document that is of interest toanyone who works with glass whether he/she is a glassblower, a pate de verre caster,or a modern beadmaker, even someone who simply collects and loves glass.Archaeologists will be especially interested in the ancient glass explanations, asGiberson focuses on simple ideas that work. 4th Printing. Price $35.00.

0.4 ' PYROMETER

A Glassblower’s CompanionA Compilation of Studio Equipment Designs,

Essays, and Glassmaking Ideas

Dudley F. Giberson, Jr.

Dudley’s text book, A Glassblower’s Companionby Dudley Giberson

Literature Corner:

Set of foundry tools: this image shows the 4” crucible with thethree tools: a skimmer, an 18” pouring handle, and a pair of 16”tongs for lifting the crucible from the furnace. This Tool Kit sellsfor $185.00

On the left: Complete 2” Burner system for the furnace includesthe Burner Head, the Ransome V-100 Venturi, a needle valve anda gauge all for $235.00. Other items you may wish to purchase:Burner stand at $65.00 and a burner block for $30.00.

What’s New and Exciting? Read about Our Mini-Foundry Protocol.And then build a mini-foundry for yourself and have some fun.

Papers of interest:1. The Development of a Mini-Foundry The Development a Mini-FoundryProtocol, by D. Giberson 20122. Images and Information Concerning the Cope and Drag FoundryTechnique, by D. Giberson, Summer 2012.3. “3 Design Projects Using the New Mini-Square Gibersons. 4. “New Ideas for the Use of Small Burners in the Glass Shop, Foundry,Pottery, and Smithy,” by D. Giberson. (These papers are free to downloadfrom <www.joppaglass.com/new_ideas/foundry/3_ways.html>.)

g

bc

ide

f

ha j

The parts of the furnace: base with legs (a), thefurnace body (b), the upper frame (c), theburner head (d), the crucible (e), the RansomeV100 venturi (f), the burner brace (g), theneedle valve and gauge (h), the furnace door(i), and lastly, the positioning tab (j)

ORIFICE CHART FOR MATCHING GAS FLOW TO YOUR MIXER SYSTEM

1/64" 0.016 #55 0.052 3/32" 0.094#72 0.025 #54 0.055 #41 0.096#71 0.026 1.4 MM 0.055 #40 0.098#70 0.028 #53 0.059 #39 0.099#69 0.029 1.5 MM 0.059 #38 0.101#68 0.031 1/16" 0.062 #37 0.1041/32" 0.031 1.6 MM 0.063 #36 0.106#67 0.032 #52 0.063 7/64" 0.109#66 0.033 1.7 MM 0.067 #35 0.110#65 0.035 #51 0.067 #34 0.111#64 0.036 #50 0.070 #33 0.113#63 0.037 1.8 MM 0.071 #32 0.116#62 0.038 #49 0.073 #31 0.120#61 0.039 1.9 MM 0.075 1/8" 0.1251 MM 0.039 #48 0.076 #30 0.128#60 0.040 #47 0.078 #29 0.138#59 0.041 5/64" 0.078 9/64" 0.141#58 0.042 2 MM 0.079 5/32" 0.156#57 0.043 #46 0.081 11/64" 0.1721.1 MM 0.043 #45 0.082 3/16" 0.188#56 0.046 2.1 MM 0.083 13/64" 0.2033/64" 0.047 #44 0.086 7/32" 0.2191.2 MM 0.047 #43 0.089 15/64" 0.2341.3 MM 0.051 #42 0.093 1/4" 0.250

DRILLSIZE

DECIMALEQUILIVANT

DRILLSIZE

DECIMALEQUILIVANT

DRILLSIZE

DECIMALEQUILIVANT

Drill Index of Common Sizes Used For Orifices

For more information on orifice size vs fuel use visit: www.joppaglass.com/burner/burnr1.html andclick on either “Low Pressure Charts or “High Pressure Charts” at the bottom of the page.


Helpful Hints and Information

Sq. 2.5-7/32 #69 orifice13-52 - - - - - - - -Sq. 2.5-3/16 #73 orifice9-39 - - - - - - - -Sq. 2-7/32 #72 orifice10-40 - - - - - - - -Sq. 2-3/16 #75 orifice6-28 - - - - - - - -

Burner Btu Low Pressure Low Pressure High PressureHead Range Natural Gas (6-8”w.c.) Propane Gas (6-8”w.c.) Propane Gas (0-25 psi)Size (1000’S) Drill Size (inches) Machinist Drill Size Machinist Drill Size

B-650 50-195 5/16” orifice #30 orifice #56 orificeB-255 40-150 17/64” orifice #36 orifice #57 orificeB-250 36-120 1/4” orifice #38 orifice #58 orificeB-250S 25-95 15/64” orifice #41 orifice #59-60 orificeB-7/32 20-70 7/32” orifice #43 orifice #62-65 orificeB-3/16 10-45 3/16” orifice #46 orifice #65-72 orifice

WEIGHT OF GLASS IN A POT

1 8 1 2 3053.63 273.9117.5 11.75 2826.20 253.511 7 11.5 2610.27 234.14

16.5 11.25 2405.53 215.771 6 11 2211.68 198.39

15.5 10.75 2028.44 181.951 5 10.5 1855.50 166.44

14.5 10.25 1692.58 151.821 4 1 0 1539.38 138.08

13.5 9.75 1395.60 125.181 3 9.5 1260.96 113.11

12.5 9.25 1135.14 101.821 2 9 1017.88 91.30

11.5 8.75 908.85 81.5211 8.5 807.78 72.46

10.5 8.25 714.37 64.081 0 8 628.32 56.369.5 7.75 549.34 49.279 7.5 477.13 42.80

WEIGHTDIAMETER HEIGHT

VOLUMN IN CUBIC INCHES OF GLASS

INSIDE OF CRUCIBLE

155 Lbs.per c.f.

Strongestmaterial

Mediumstrength

Weakestmaterial

G-20IFB

K-20IFB

RigidFiberfrax

board

Blockinsulation

Castblock mix

Fiberfrax8 lb. density

"Ins" value4.25

"Ins" value5

"Ins" value12

"Ins" value9

"Ins" value10

"Ins" value14

Watts needed per cubic foot of kiln space(Chart to calculate the overall heat requirements for a kiln)Sample wall material→ (4.5" IFB) (2.5" IFB + 1" Frax) (3" Frax)Use Degrees F “Ins Value” = 19 “Ins Value” = 25 “Ins Value” = 42

↓ ↓ —————(Watts per cubic foot= wpcf)————— Annealing 950 900 wpcf 700 wpcf 500 wpcfPick-up 1150 1000 wpcf 825 wpcf 650 wpcfSlump 1500 1500 wpcf 1200 wpcf 900 wpcfCasting 1650 1650 wpcf 1325 wpcf 1000 wpcfPottery 2250 2000 wpcf 1800 wpcf 1600 wpcf


Insulation Value and Strength Comparisonof Some Common Kiln Building Materials

ORDER FORMPLEASE COPY THIS FORM AND FILL OUT. THEN PHONE, FAX, OR“SNAIL MAIL” THIS INFORMATION TO:

JOPPA GLASSWORKS, INC.P. O. BOX 202

WARNER, NEW HAMPSHIRE 03278(603) 456-3569, Fax at (603) 456-2138

YOUR NAME

YOUR BUSINESS NAME

MAILING ADDRESS (FOR US MAIL)

YOUR STREET ADDRESS (FOR UPS)

CITY, STATE, ZIP

PHONE (BUSINESS & HOME)

MASTER CARD VISAor ACCOUNT NUMBER _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ (EXP. DATE) _ _ / _ _

YOUR SIGNATURE (IF USING CHARGE CARD)

X____________________________________________

I wish to order the following:

1. _____________________________ $_______.____2. _____________________________ $_______.____3. _____________________________ $_______.____4. _____________________________ $_______.____5. Ship fees (real charges by UPS or USPS)

Please call ahead for an actual agreed upon feeif this is an important issue for you.

$_______.____

6. TOTAL $_______.____


Price List, October 2015


Burners and related merchandise:Giberson Ceramic Burner Heads, (see page 2 for sizes to match equipment)

Standard 4” diameter Giberson Heads– six sizes 175.00Mini-Square 2” Giberson Heads– two sizes 115.00Mini-Square 2-1/2” Giberson Head– two sizes 135.00

Pipe Warmer Burner Package (page 10) 249.50Dudley’s Garage Burner (page 9) kit (head, venturi, needle valve, and plans) 278.50Venturi Package For hp Propane (inc standard head, gauge, needle valve and venturi) 325.00Needle Valve - All Brass, high quality for high pressure propane- 1/4” NPT (f) 20.00Gauge (0-30 psi) for high pressure propane- 1/4” NPT (m) glass face plate 16.00Spare Orifice for Ransome Venturi 6.00

Mixers and Blower:Alfred Type “Tee” Mixer– 1-1/2” use with Low Pressure Natural or Propane, see pg 8. 99.00Ransome Venturies V150 with orifice (see page 8 for other sizes & prices) 130.00Dayton 1TDP5 Blower with modifications (see page 8) $238.00

Elements and element accessories for mounting elements in kilns:Element Prices (see page 16 for element sizes and prices)Thermocouples, Type “K” 36” long, 20 ga. wire, ceramic tip, can be longer at $2.00 a foot 20.00“Wall-Tubes” or “Thru-Tubes” for insulating element leads through metal shell of kiln walls 6.00Marinite Panel Board p. 17 (6” x 12” x 1/2” thick) for building element connection board 14.00Marinite Panel Board p. 17 (4” x 4” x 1/2” thick) for building element connection board 5.00"Donut" Insulators p. 13 Donut ID x OD x Width

Donut #5 .460” x .770" x 1/2” .75Donut #7 .585” x 1.00 x 1/2” 1.95Donut #8 .680” x 1.165 x 1/2” 2.15

Wire for attaching the donuts for 30 feet (17 ga. Nichrome is recommended) 10.00for 50 feet (17 ga. Nichrome is recommended) 15.00

Element Support Rods, p. 12 1/4” by 30” -- Mulite 19.003/8” by 30” -- Cordierite 12.651/2” by 30” -- Cordierite 12.65

Cutting Fee for Ceramic Support Rods 0.50(if your rods are cut to 15”, no boxing fee, as they fit in our 18” standard box)Boxing Fee for full length rods (Hand built double-wall container, min. 5 rods) 8.00

Kiln Controllers (see page 19):Joppa’s Auber Kit 2372P (30 Ramp and Soak profile, 1/16 DIN, Type K.) Full Instructions 165.00Joppa’s Auber Kit 2372 (Set Point Controller, 1/16 DIN, Type K.) Full Instructions 150.00“How to Build Your Own Controller, Vers. 3.5.2” paper (see pages 18 & 19) (free with kits) 15.00Relays: Mercury Relays and Mechanical Relays price list (see page 19) 25 amp Solid State Relay (Control/12 VDC; switch 120, 240 up to 480 VAC) p. 19 35.00

Literature corner:A Glassblower’s Companion (see page 21 for more info) 35.00

Construction Papers:Construction Paper #3, “How to Build Your Own Controller” (pp.18 & 19) $15.00Construction Paper #5, “Large Slumper/Caster Kilns” (pp. 15 & 16) $15.00

Mini-Foundry Supplies:Crucibles, tongs, skimmer, etc. (see page 21) $185.00

For most current prices check our web site:www.joppaglass.com/price/pricelist.html

MasterCard and Visa AcceptedALL PRICES SUBJECT TO CHANGE , WITHOUT NOTICE

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