SCIENCE 



New Series 

 TOL: LI, No. 1326 



Frtday, May 28, 1920 



Single Copies, 15 Cts. 

 Ansual Subscbiftion, S8.00 



Replaceable Unit Hevi-Duty Electric 

 Furnaces 



For continuous operations at any temperature up to 1100°C. 2012°F. 



Hevi-Duty Crucible Furnace 



These furnaces are furnished com- 

 plete with transformer and rheostat. 

 The return coils, of heavy wire, are 

 economical in the use of current, have 

 large heating capacity, last almost in- 

 definitely, and are easily repaired in 

 case of damage. 



The furnaces are recommended for 

 laboratory work, also for numerous 

 heat treating shop operations, such as 

 preheating of High Speed Steel ; Har- 

 dening and Annealing of High Carbon 

 Steel Tools ; Enameling of Jewerly, 

 including Watch Dials ; fusing of 

 Bifocal Lenses ; Annealing of Com- 

 mercial Glassware, etc. 



The Furnaces are regularly of three different types, namely : Tube, Muffle, 

 and Crucible. There are certain standard sizes, but special sizes may be 

 built to order. For large capacity work they are built in sections for sizes as 

 desired. 



Write for bulletin giving full details 



iriEnd 



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