Transnctioii.'i Society Soi-aJ. Archilccls and Murine Engineers, Vol. 2/, iQip. 



Plate 7 3 



To illuytralc paper nii "New Developments in High Vactiuni Apparatus," 

 by (j L. E. Kothny. Esq., Member. 



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Curve Illustrating the influence of varia- 

 tions in live steam pressure. 



NORBIS PETERS, INC.. LUMO.. WASHINGTON. D. C. 



