610 
a, a en KOI 
With — — 2,932 or BA *—1,712and/=0,91 and with — = 4,098 
a, a, b, 
this equation becomes: 
0.5579 078 16m 5 1,197 + 0,702 « 
14 1,11582-+0,8162* 614 2,3942 + 0,702 27 
For «—1 the first member is equal to 0,468, and the second 
~ 
…) 
member ( without the factor =) equal to 0,464, so almost the same. 
J 
For «=O the first member = 0,5572, and the second member 
equal to 1,197. To obtain equality the factor wouid have to be 
1 Z 
smaller than ae For «0,6, the first member becomes equal to 
0,535 and the second member equal to 0,6, so that the factor would 
be equal to 0,89, which would be slightly too great according to the 
eee a oan 5 
probable value of f;. With f;=7, — 8 equal to 0,83. SCHEFFER’S 
vg 
observations, therefore, yield a value for wv somewhat greater than 
the value of « which satisfies the given equation. Possibly the 
constants occurring in this equation, may have to be revised, and 
n put somewhat smaller than 4,098. The value of p‚ for ether, 
which was found by Scurrrer larger than 35 (viz. 36,1), would 
also point in the same direction. But then / is also reduced to a 
smaller value than 0,91. 
As may be supposed as known, the plaitpoints on the p,7-lines 
for constant value of « do not lie at the highest value of 7° Be- 
tween the value of x for the minimum critical temperature and that 
of the remarkable point they lie on the vapour branch, and in the 
remarkable point they are transferred to the liquid branch. But for 
the values of « which differ little from this point, the distance 
between vapour branch and liquid branch is very slight, and in the 
point itself the distance is zero. From the values printed by Dr. 
SCHEFFER in large type the value of : ze, for the plaitpoint line in 
; pdi 
the neighbourhood of the remarkable point can be, therefore, calcu- 
Ae Tip 
lated with elose approximation. Then, however, DAT 
even for the highest value of the water-content, and so certainly 
higher than fr. From the course of the three-phase pressure this 
value is found to be 7,03 at the highest temperature, and this goes 
to support the expectation that the three-phase line touches the 
plaitpoint line. But at the same time this shows that the remarkable 
= 9,4 is found 
