KAMERLINGH ONNES. I. Improvenrent to the open mercury manometer of reduced height with transference of pressure by means of compressed gas. 

 n. Improvement in the transference of pressure by compressed gas especially for the determination of iaothennals. 



F.g. 1. 

 S !0 >5 211 •: 



\-%i 



Proceedings Royal Acad, Amslerdam. Vol. VIII. 



