Traiisnctioits Society Naval Architects and Marine Engineers, Vol. 2j, igip. 



Plato 73 



To illustrate paper on "New Develot>ments in High Vacuum Apparatus," 

 by G. L. E. Kothny, Esq., Member. 



5^ 



Curve illustrating the influence of vari< 

 tions in the back pressure at discharge. 



NORRIS PETERS. IHC. LITHO.. WASHINGTON. D. C„ 



