SCIENC 



New Series 

 Vol. L, No. 1294 



Friday, October 17, 1919 



Single Copies, 15 Crs. 

 Annual Subsceiption, 85.00 



Modified McLeod Vacuum 

 Gauge 



Vacuum gauges on this principle have been re- 

 peatedly redesigned, each time with a view to cor- 

 recting and simplifying complicated construction 

 and design. These refinements have finally resulted 

 in this highly simplified gauge. 



Besides retaining the features of the old McLeod 

 Gauge of 



Ease of reading 



Accuracy (to xo millionth of an atmos- 

 phere) 

 this new Gauge is 



Easier to manipulate 



Simpler 1 



Smaller > in construction 



More compact J 



Without ground joints 



The Modified McLeod Vacuum Gauge is an- 

 other product of Eimer and Amend's scientific 

 blown glass shops. It is workmanship of this 

 calibre which has made E & A synonymous with 

 fine glassware and accurate scientific instruments. 



EIMER & AMEND 



FOUNIIED 1831 



Main Offices and Showrooms A-2 



3d Ave., 18th- 19lh Street, New York \^^ 



Pittsburgh Branch 

 2011 Jeakins Arcade 



