Notion to IZtffldar.— When yoa flaish readlnx 

 this mftfazinet place a I cent stamp on this notic*» 

 mail the magazine« and it wiU be placed in the 

 hands of our soldiers or sailors 



No wrapplag'-No Address. 



0^6 



SCIENCE 



New Sbbibs 



Vol. XLIX, No. 1268 



Friday, April 18, 1919 



SiMOLB COPIKS, 16 CTS. 

 ASKUAL SUBSCBIPnOR, tS.OO 



BARNSTEAD WATER STILLS 



T^e choice of discriminating workers 



'T'HAT these stills produce double-distilled water of unequalled purity, free from ammonia 

 •• and other organic impurities, has been the e.xperience of thousands of users, including 

 eminent chemists and prominent manufacturers. 

 A remarkably low cost per gallon is the result of preheating the incoming raw water by using it 

 to cool the vapor forming the condensate. 



Bamstead Stills are automatic in operation, requiring practically no attention after being started. 

 They are quite compact yet for thorough cleaning the boiler is completely accessible by simply 

 turning a few thumb screws. 



CAPACITIES 

 For Gas Heating: i to lo gals, hourly (5 sizes) 

 For Electric Heating: i to 10 gals, hourly (5 sizes) 

 For Steam Heating: i to 100 gals, hourly (10 sizes) 



Wrilefor our booklet and quotation. 



EIMER AND AMEND 



FOUNDED 1851 



Third Ave., 18th to 19th Street NEW YORK CITY 



Branch Office and Showroom: 2011 Jenkins Arcade, PITTSBURGH, PA. 



