Seale 1, 
Proceedings Royal Acad. Amsterdam. Vol. II, 
Seale Ys 
ä 8 
H. KAMERLINGH ONNES : „Methods and apparatus used in the Cryogenic Laboratory II: Mercury pump for compressing pure and costly gases under high pressure”. PLATE VI. 
so Scale "/, 
5 
= 
2 
roca rom ar A SARA NCN, 
lig. 8. 
