The Demonstration Root-Pressure 



Manometer 



designed by Professor Ganong for 

 demonstrating exudation or bleed- 

 ing pressure, is correct in principle 

 and gives striking results. It is 



Correct in Principle 



BECAUSE, unlike the stout mer- 

 curial manometer tube generally 

 used, the total volume of this 

 Manometer falls well within the 

 exudation capacity of all ordinary 

 plants. In consequence, it 



Gives Striking Results 



BECAUSE the true pressure is 

 indicated. The index tube is long- 

 enough to indicate an atmosphere 

 of pressure. A meter rule is carried 

 in a clamp for reading the height 

 of the mercury column. Finally, 

 the instrument is 



Simple and Convenient 



BECAUSE, once filled, it can 

 always be kept ready for immedi- 

 ate use. The price includes all 

 connections and 10 cc of mercurv 



$4.75 



Bausch & Ipmb OP tical ©• 



NEW YORK WASHINGTON CHICAGO SAN FRANCISCO 



london &oCHESTEn,N.Y. rRANKFORT 



Leading American Manufacturers of Microscopes, Projection Apparatus (Balopticonsi. Photo- 

 graphic Lenses, Engineering Instruments, Binoculars and other high grade Optical Products. 



