490 CENTEAL SCIENTIFIC CO., CHICAGO, U. S. A. 



THERMIT FOR LABORATORY EXPERIMENTS 



We list the necessary equipments for a series of four interesting experiments with Dr. Gold- 

 Schmidt's Thermit, a compound of a metallic oxide and granulated aluminum which, when ignited, 

 starts a chemical reaction which will produce a temperature of 3000 C. This is now used extensively 

 in welding fractures in iron castings and rails, as the molten thermit iron has the property of melting 

 the surface of the iron it comes in contact with, and forming a solid mass. 



13418. THERMIT, Experiment I. Welding a small piece of steel to a plate. 



Steel Plate, % 6 inch thick. 2 Cans Thermit. 

 2 Pouring Cups. Bottle Ignition Powder. 

 Pair Dark Glasses to protect Eyes. 

 Complete set " $2.50 



13419. THERMIT, Experiment II. Burning a hole through a plate. 



Steel Plate, 9 inch square x % inch thick. 4 Packages Plugging Material. 



Tripod. Bottle Ignition Powder. 



2 Cans Thermit. Pair Dark Glasses. 



Tapping Spade. Large Crucible. 



Shipping Weight, 102 Ibs. 

 Complete set 20.00 



13420. THJ3RMIT, Experiment III. Welding a large boss to a steel plate (showing the manner of weld- 



ing in industrial uses). 



2 Steel Plates, % inch. 2 Fire-Brick Molds, i . 



Large Crucible. Tripod. 



Bottle Ignition Powder. 2 Welding Portions. 



Package Luting Material. Tapping Spade. 



2 Packages Plugging Material. Pair Dark Glasses. 



Shipping Weight, 152 Ibs. 

 Complete set 21.50 



13421. THERMIT, Experiment IV. Pipe welding. This experiment shows the following peculiar char- 



acteristics of the slag: First, its very high temperature; second, that it sets at a very high 



temperature; third, that in plastic condition it is highly refractory remaining in a layer distinct 



from the steel. 



4 Pieces Standard Pipe, 6x1 inches. 3 Welding Portions. 



Mold. Small Crucible. 



Pair Tongs. 1 Set Clamps. 



Bottle Ignition Powder. Pair Dark Glasses. 



Shipping Weight, 86 Ibs. 

 Complete set 35.00 



13422. THERMIT COMBINATION SET, suitable for all four experiments. Shipping weight, 270 Ibs. 



65.00 



13423. THERMIT COMBINATION SET. Experiments I-III. Shipping weight, 230 Ibs 30.00 



13424. THERMIT, black per pound .65 



13425. IGNITING MIXTURE (8 oz. smallest quantity sold) per pound 1.50 



THERMO-COUPLES, see Pyrometers. 



No. 13426. 



THERMOMETERS, ALL KINDS 

 THERMOMETERS FOR GENERAL USE 



13426. THERMOMETERS, Solid Stem, Engraved Scale, for general use. Diameter of stem, about V* 

 inch. Graduated in 1 divisions. 



No A B C D E F 



Range, degrees C to 60 -10 to 110 to 150 to 200 to 250 to 350 



Length, inches 10 12 12 14 14 16 



Each 1.10 1.20 1.25 1.60 1.80 2.00 



13428. THERMOMETERS, Solid Stem, Engraved Scale, same as No. 13426, but graduated in Fahrenheit 

 scale, in 2 divisions. 



No A B C 



Range, degrees F 10 to 220 30 to 400 30 to 650 



Length, inches 12 14 16 



Each 1.20 1.60 1.80 



13430. THERMOMETERS, Solid Stem, Engraved Scale, same as No. 13426, but with double scale. 



No A B C 



Range, degrees C -10 to 110 to 200 to 350 



Range, degrees F 10 to 220 30 to 400 30 to 650 



Each 1.80 2.00 2.50 



