Tninsnclions Society Nazv! Architects unci Murine linomccrs, l/ul. 3j, igii^. 



Plate 6 8 



To illustrate paper on "Nezv Developriicnfs in High Vacuum Apparatus,' 

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



^ 



^. ^ % K ^ 



Curves showing permissible air leakage 

 for marine surface condensers. 





I 



Nanms peters, inc., litho.. washihotoh. 0. c 



