(513) 
| Taking into account, that A, = — 0,616, the latter equation yields 
A „0,090 0,8318 
—=2 KX 6,616 — 2 == 10,658 — 8,155 = 2,508. 
k (0,102)? 0,102 
It is superfluous to mention, that the manner in which q is calcu- 
lated, involves that equating the first term of (5) with a = 29,766, 
fl As, 
an identical value — is found. 
For the descending branch we may therefore write either (according 
to (6)) 
0,8318 0,090 
— 29,766 andre vt Len 
F ada MOP en 
or, according to (4) y = 31,508 — 2,503 A — 8,651 A?, 
putting again A for ko (A positive). 
For the calculation of the ascending branch we have to make 
use of the values of £ between 0 and 3000. From these I calculated 
as the most probable values: 
2,153 __ 0,1906 
= 25,456 ze É 
EE 0,102’ °~ (0,102)? 
At once we see, that we have to deal here with a branch of 
another parabola than in the descending branch of the electro- 
capillary-curve; 5 being nearly three times, ¢ more than twice as 
great. The slope of the ascending branch is therefore, as all experi- 
ments show, steeper than that of the descending one. 
The following table may serve to verify the values, found for a, 
b and ¢, by means of the experiments. We notice, that the-experi- 
mental data for the ascending branch are few in number, and 
moreover are considered as unreliable by the experimentators. +) 
Notwithstanding the agreement may be considered to be satis- 
factory. 
1) See i.e. SMITH, |, c. pag 455. 
38 
Proceedings Royal Acad. Amsterdam, Vol, LV. 
