SCIENCE 



New Series 



Vol. LII, No. 1334 



Friday, July 23, 1920 



Single Copies, 15 Cts. 

 AsKUAL Subscription, $6.00 



Repla(;eable 

 Unit \ie\\=LMw Electric 

 Furnk^ 



«.. ^"^ 



For continuous operati. ^^ 

 temperature up to 1 100\ ^ 



any 

 °F. 



These furu, '?*-. 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 indefinitely, 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 ; 

 Hardening and Annealing of High 

 Carbon Steel Tools; EnameHng of 

 Jewelry, including Watch Dials; 

 fusing of Bifocal Lenses; Annealing 

 of Commercial 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 builtfto order. For large capacity work they are built in 

 sections for sizes as desired. 



Write for bulletin giving full details 



Hevi-Duty']Crucible Furnace 



iTiEnd 



NEW YORK 

 3rd Ave., 18th— 19th St. 



PITTSBURGH BRANCH 

 2011 Jaekion Arcade 



