SCIENGe 



NEW LABORATORY EQTlPMENT 



Freas Steam Hot Pla| 



A girea.'^'% venience espe- 

 cially ft o, ^ lege and uni- 

 versity i '^'^itories. One 

 to every ' ^ut or one to 

 every eight laboratory stu- 

 dents are suitable averages. 

 The students are able to 

 hasten many reactions 

 very materially by having 

 this convenient source of 

 heat which can be regu- 

 lated as desired. Oper- 

 ating expense is negligible, 

 the hot plates are per- 

 fectly safe, and they should 

 last as long as the labor- 

 atory. Dr. Freas spent 

 several years working out 

 the practical problems 

 which arose in connection 

 with these hot plates. As 

 at present constructed, 

 they are highly satisfac- 

 tory and have already been 

 installed in several new 

 laboratories. 



DESCRIPTION. 



Freas Hot Steam Plate under Laboratory Hood. The hot plate is 24 inches 



long by 12 inches wide. 

 The bed plate is of brass to which copper tubing is attached. The copper tubing 

 carries the steam and is suitable for any working pressure. Lead is poured 

 around the tubing. Lead is used for this purpose to distribute the heat and 

 because it is practically unattacked by laboratory fumes. By means of a trap 

 the condensed steam is drained back to the boiler. The plate is mounted on 

 four legs, 9 inches high. Price of the hot plate complete with valve traps and 

 ^2 inch steam pipe connections $80.00 



AND 



kTTiEnd 



NEW YORK CITY 

 3ri At«^ 181k— 19tli St. 



lesiMMM 



PITTSBURGH BRANCH 

 4048 Jenkia* Afcade 



