1920] 



on Low Temperature Studies 



255 



the time taken for settling, after an exposure, was less, since the gas 

 equilibrium in the charcoal was not so much disturbed as when the 

 pressure was raised. 



The relative displacements resulting from the " gas-cooled " cell, 

 as compared with those from the " liquid-cooled " cell (cell all 



MANOMETER 

 .4 CMS 



Ql) H^SQ MANOMETER 



(H ALCOHOL 



(C) GAS COOLED CELL H 2 S0 4 MAN" 



(CO H^SC; MANOMETER 



(tr) ALCOHOL 



(C) GAS COOLESb CELL-H.,! 



3 MiNUTt! 



Fig. 6. — Vertical Manometer, 1, 15 c C. Radiation ; 

 2, 100° C. Radiation. 



immersed) are included in the curves, Figs. 6 and 7, which show how 

 the readings grow with continued exposure. Separate curves for 

 radiation from a Leslie cube at 15° C. and 100° C. respectively are 

 given, also comparative readings with either alcohol or sulphuric 

 acid in the manometers. (Later petroleum was used, fractionated 



