416 
experiments for some time to come, so that for the temperatures of 
series I and II] we have not been able to give such extensive series 
of measurements as in series II. 
From Table I we finally obtain Table II (see p. 415) 
§ 7. Smoothed values of the virial coefficients, and corrections of 
the international hydrogen thermometer to the absolute scale. 
These corrections are to be determined from the virial coefficients 
B by the method employed by KaAMERLINGH Onnes and BRAAK in 
Comm. N°. 1015. For this, however, it is desirable to use smoothed 
values. This was tried by plotting log 5 as a function of log 7. 
Taking account of the accuracy of the various measurements there 
seemed to be much to recommend the smoothing given in Table III 
in which the temperatures 7 = 7 — 273.09 are given in KELVIN 
degrees, Table IV having been used for the calculation). 
TABLE Ill. | 
H,. Smoothed virial coefficients | 
B; for hydrogen vapour. | 
6 Bar 
— 9590 47 — 0.00047 | 
— 2550.32 — 0.00049 
— 2579.10 — 0.00055 
In Table IV these values of B47 have been used to supplement by data 
for —— 252° C., — 255° ©. and-— 257° ©. the list given in Women 
N°. 1015 of experimental corrections 4f;= 6 — ¢; of the international 
hydrogen thermometer to the absolute scale. 
TABLE IV. 
Corrections of the international | 
hydrogen thermometer to the | 
absolute scale. | 
| t; Lt; in degrees K. 
— 2520.59 C. + 0.118 
— 255°.45 + 0.125 
— 2579.24 + 0.144 
