SCIENCE 



New Sebies 



Vol. LV, No. 1421 



Friday, March 24, 1922 



SiNQLE Copies, 15 Cts. 



ANNTJAL S0BSCKIPTION, $6.09 



RESEARCH APPARATUS 



The Freas Sensitive Water Thermostat 

 in regular use in the leading American 

 and Canadian Universities and Colleges. 



Designed to furnish continuous constant 

 temperature from lowest temperature of 

 water or water solution available up to 

 50° C. Large size is sensitive to 2/1000° 

 C. Small size (see cut) is sensitive to 

 1/100° C. The large size has rectangu- 

 lar copper lined tank of 85 gallon capac- 

 ity. The small size has round inner glass 

 tank of 10 gallon capacity. Both sizes 

 use the standard Freas sensitive mercury 

 regulator. 



Price of the large size $480.00 



Price of the small size $220. 00 ^ 



For details of the large size thermostat, 

 also of the Freas water bath, write for 

 Bulletin "Freas Water Baths and Ther- 

 mostats." 



For details in regard to other forms of 

 Freas apparatus we refer to the following 

 bulletins: / 



Freas Conditioning Ovens; Freas Con- i 



ductivity Apparatus; Freas Incubators t 



and Sterilizers; Freas Ovens aind Tube ^*— 

 Furnaces; Freas Vacuum Ovens. 



Freas Water Thermostat, Small Size 



Any of these bulletins will be sent without charge on request, also information in re- 

 gard to Freas Steam Hot Plate or Freas Hot Water Mixer 

 E— AND m m.w . w,...».p,.,„ — ^ 



imer ^Amend 



185 1 

 NEW YORK CITY \M^/ PITTSBURGH BRANCH 

 3rd Ave., 18th — 19th St. VVjJX 4048 Jenkins Arcade 

 Washington, D. C. Display Room, Suite 601, Evening Star Building, 

 Pennsylvania Avenue and 11th Street. 



