672 
Having thus calenlated all ihe liquid volumes, we were able, taking 
the first two of the above corrections into account, to obtain the 
volumes of the saturated vapour. In this it was assumed that the 
temperature of the bath extended to a distance of 2 ems. above the 
surface of the liquid. 
The following method was adopted of reducing the gaseous argon 
in the glass and steel capillaries from the point of the capillary just 
mentioned up to the tap &, to terms of the normal volume. The 
portion of the glass capillary within the cryostat was divided into 
different parts for each of which the mean temperature was known 
from previous papers’). The temperatures of the part of the glass 
capillary outside the cryostat and of the steel capillary up to the 
tap 4, were obtained from thermometers during the measurements. 
The volumes of all these portions were known from the calibrations 
and the pressures from the vapour pressures already published *) 
together with those added by the present measurements. 
In order now to cbtain the normal volume of all these portions 
at different temperatures we again make use of the modified series 
pun — An fl + BO) p + CP) p? +....} 
r 
V 
gnd An = Anocc, A + aat), it follows that 
Since vy = 
pV 
N = SO 
Ayorc (1 + aa t) [1 + Be p + CP) p°] 
The virial coefficients necessary for the employment of this 
equation were taken from the equation VII. A. 3. In all these 
calculations the coefficient C'@) could be neglected. 
We may again refer to previous papers‘) for the corrections 
which have to be applied to the volumenometric determinations. 
For the normal specific mass of argon we used the value given 
by Ramsay and Travers *) 0.001782. 
7 
1) C. BRAAK, Thesis for the doctorate, Leiden. 1908. p. 16. 
2) Proc. May 1910, Comm. N’. 115. 
8) In these formulae p is the pressure in atmospheres, vy the volume expressed 
in terms of the normal volume as unit, N the normal volume, V the actual expe- 
rimental volume and za, the coefficient of expansion in the AvoGApro state, 
0.0036618. For the notation see also Suppl. No. 23. 
4) Proc. May 1911, Comm NP. t21a, Proc. Sept. 1912 Comm. N°. 127c and 
W. J. pe Haas. Thesis for the doctorate, 1912. 
5) W. Ramsay and M. W. Travers, Proc. R. S. 67. 329, 1900. 
