SCIENCE 



>9EW SEBIK8 



?0L. XXXVI. NO. 925 



Feiday, September 20, 1912 



SiNeLI C0PIB8, 15 Cts. 

 ANHUiL SUBBCBIPTIOK.SS.OS 



The May = Nelson Rotary Pump 



Write fof Descriptive 



Booklet " M N " 



to 



the Sole 



Distributors 



PATENTED 



An "all metaP^ pump of large 

 capacity, working on an entirely 

 new principle* 



The 2 ring pump will quickly 

 evacuate a 6 litre vessel to 0,05 

 mm* of mercury* 



The 3 ring pump will reduce 

 the pressure down to 0*002 mm* 

 of mercury* 



SPECIAL FEATURES 



/c.<^ 



fjj^v^orwn 



Rapid in action. 

 Compact and unbreakable. 

 Produces a high vacuum. 

 Efficiency unaffected by liquids. 

 Especiafly suited for vacuum distillation 

 Requires little attention or adjustment. 

 Can also be used for producing blast. 



SEP 20 19 



EIMER & AMEND ^"""X^^Oss^k^- 



NEW YORK CITY 



