SCIENCE 



Var Bs&zn 



TOL. XLVII. No. 1207 



Fbiday, Febkuaby 15, 1918 



BniSLa Copim, IS Cra. 

 AnniAL Sdbsobiptioh, t6.0t 



Kraus Mercury Vapor Stills 



These stills give practically a complete vacuum. 

 Capacity when used in connection with a water 

 pump is about one and one half liters every 

 ten minutes. They are made of special high 

 resistant Pyrex Tubing, so that they stand 

 repeated heating without breaking. Break- 

 ages when they do occur can usually be repaired. 



As ordinarily furnished, the pump consists of 

 two parts — a coarse and a fine pump. If de- 

 sired, both parts may be supplied either coarse 

 or fine. Excellent results are obtained with the 

 Kraus Pump in connection with the ordinary 

 water pump, although if used with an auxiliary 

 pump of greater capacity, not operated by 

 water, still more satisfactory results are ob- 

 tained. 



The pump is furnished complete with iron 

 stand, twelve feet of asbestos cord for wrap- 

 ping, and Tirrill Burner as illustrated in the cut. 

 Price complete as above described, not includ- 

 ing water pump or other auxiliary pump, $30.00. Price of glass parts only, 

 either coarse or fine, $12.00 each. Immediate shipment from stock. 



EIMER & AMEND 



18th to iOtu streets THIRD AVKNUE, NEAV YORK CITY 



BRANCH OFFICE AND SHOWROOM : — Jenkins Arcade, Pittsburgh, Pennsylvania 



