( 872 ) 
A 
T, BE: 1M aa 7: PiP) Et Pre ed ep VE (20) 
are in agreement with the foregoing conclusions. The value of A 
for hydrogen at + 5° C. was given by Jourr and Kervin as — 0.03 
which is somewhat greater than the above calculated value of 
— 0.023; but numerical non-correspondence is in this case of no 
great importance seeing that Jour and KerviN's results for hydrogen 
were very irregular, and the authors declared them to be less trust- 
worthy than those obtained with other gases. 
§ 9. With regard to “inversion-points”, it is at once evident that 
the inversion temperature is a function of the initial pressure, and 
that it does not reach the value 7;,,—= 77; (see table I). From the 
curves of fig. 2 have been read the following inversion temperatures 
corresponding with various initial pressures. 
DA Du ML 
Pressure-difference Inversion temperature. 
1 atm. — 72°.6C. 
De — 73 2, 
ile — 74 1,, 
DO —75 8, 
OUR ies — 11 8,, 
40 „ —_79 9, 
DO — 81 9, 
OO — 83 6, 
TO se —85 9, 
SO a3 — 88 3, 
0 er — 90 .0,, 
LOOT). — 91 .7,, 
Thus the relation between inversion-temperature and pressure- 
difference is practically linear (fig. 3), and with increasing initial 
pressure the inversion temperature falls. If we extrapolate the above 
table we obtain for a pressure of 115 atm. an inversion temperature 
of — 95° C.. where OrszewskKi found —80°.5 C. It is worth noting 
that Nakamura?) calculating from Remeanum’s equation of state found 
!) S. Nakamura: refer. Journ. de Physique (4). 2 p. 704. (1903), 
