SCIENCE 



New Sekies 



Vol. LIV, No. 1400 



Friday, October 28, 1921 



-SutaLE Copies, 16 Cts. 

 Annual Subsceiption, $6.00 



NEW LABORATORY EQUIPMENT 



Freas Steam Hot P'?,te. 



Freas Hot Steam Plate under Laboratory Hood. 



A C^ convenience espe- 

 cia ^ s* ■ college and uni- 

 vert * isi boratories. One 

 to t ^^ four or one to 

 ever> ^ % ■ laboratory stu- 

 dents %'^ i table averages. 

 The s\ '^ "s are able to 

 hasten\ % ly reactions 

 very mi ^"^ ly by having 

 this con ^ ^ It source of 

 heat whi '^*^ n be regu- 

 lated as '^•'^.^d. 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 

 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 



EimEr .^ATTiETid 



NEW YORK CITY nIp^ 



3rd Ave^ 18th— 19th St. XJv^ 



PITTSBURGH BRANCH 

 4048 Jenkiai Arcade 



