1)K. AV. TIJAA^EES, WE. (4. SENTEE, AND DE. A. JAQUEEOI* 
Kw; 
June 13th, 1902. 
Vapour Pressures of Liquid Hydrogen. 
Pressure on gas 
Temjjerature of 
Temperature 
Vapour pressures 
nf 
Temperattu’e 
in thermometer. 
dead-space. 
of stem. 
liquid hydrogen. 
Found. Calcidated. 
i 
inilliuis. 
°C. 
°He. 
milliuis. 
1 
° He. ° He. 
71-45 
20-0 
58 
770-0 
20-43 20-46 
This result is the mean of two consecutive observations, which were nearly identical. 
The quantity of pure liquid hydrogen in the vapour pressure bull) (m, tig. l) was 
increased between the two readings. 
For the measurements of the vapour pressure of liquid oxygen with this 
thermometer, see Part IT, 11 (IIP). 
III. Thermometer C (267 cub. centims. bulb). The thermometer was tilled with 
helium from the same sam])le as was used in the last series of exj^jeriments. 
Ice-Point of Thermometer, June 11th, 1902. 
Pressure on gas 
in thermometer. 
Temperature of 
dead-space. 
Constant. 
milliuis. 
° C. 
Wain thermometer .... 
924-25 
16-9 
91-505 
Au.xiliary thermometer. . . 
954-0 
17-3 
8-093 
