New Series 



Vol. LV, No. 1430 



Peiday, May 26, 1922 Single Copies, 1.5 Ct.s. 



Annual Subscription, $6.00 



TESTING INSTRUMENTS 



Abbe Refractoraeter No. 5844 



The Abbe, with heating arrangement; 

 for quickly determining with white light 

 the refractive and dispersive powers of 

 liquids, also of solids having one polished 

 surface. Readings are direct, no calcula- 

 tions being necessary. 



This instrument is used particularly for 

 the accurate testing of oils, also, with 

 special scale, for the testing of sugars. The 

 Bausch & Lomb, the Zeiss, and the Spencer 

 makes all are carried in stock for immediate 

 shipment. 



The Butyro refractometer is primarily 

 intended for the examination of butter, but 

 is also adapted for the refractometric ex- 

 amination of fats and oils, also for deter- 

 mining the percentage of water in concen- 



trated glycerine solutions. A special thermometer is used in the testing of lard. 



The Immersion refractometer is used for the examination of liquids of 

 low refractive index, as milk, serum, aqueous, alcoholic and ethereal solutions. 

 Write for additional information, giving full details of 

 your requirements. 



■ founded: 

 NEW YORK 

 3rd Ave., 18th — 19th St 



I S 5 I I BU B ilBiM 



PITTSBURGH BRANCH 



4048 Jenkins Arcade 



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

 Pennsylvania Avenue and 11th Street. 



