SCIENC 



23 192^ 



New Series 



Vol. LIV, No. 1395 



Friday, September 23, 1921 



Single CopiSs, 16 Cts. 

 Annual Subsckiption, J6.00 



NEW LABORATORY E .^IIPMENT 



Freas Steam Hot 



I He. 



A , ^^ convenience espe- 

 cial ^ college and uni- 

 vers % boratories. One 

 to e ^'g four or one to 

 ever> ^ % laboratory stu- 

 dents '^rt itable averages. 

 The Si v". 'S.ts 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. 



The hot plate is 24 inches 

 Freas Hot Steam Plate under Laboratory Hood. long bv I'' 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 

 J/2 inch steam pipe connections $80.00 



inEnd 



NEW YORK CITY 

 3rd Atc, I8th— 19th St. 



185 I ^B^ 

 PITTSBURGH BRANCH 

 4048 Jenkins Arcade 



