674 
PROFESSORS A. W. REINOLD AND A. W. RUCKER 
The films were then separated. At 27 m the sphere was flooded. The stop-cock 
was opened at 46 m , and the following values of 8 were obtained, beginning at 48 m :— 
8=19-87, 20-03, 20-15, 20*04, 20T1. 
The last three readings were as follows :— 
t 
a 
Co 
a 
Mean. 
h. m. 
1 2 
{Ik Ct (3, 9)} 
{23k Y (1, 3)} 
20-09 
5 
jlk Ct (3, 0)} 
{24k Y (1, 3)} 
20-12 
9 
{lk R (2, 6)} 
All black 
19-96 
20-06 
We noticed that in this case, when the black reached the bottom, the liquid ring 
disappeared, and we are, therefore, inclined to attribute the last reading to some 
slight change in Y. 
The decrease in the value of 8 indicates a bulging of the cylinder, i.e., a falling-off 1 
in its surface tension. 
dT/T= — 0*030/3*7 X 0'98 = — 0"83 per cent. 
Experiment XVI. 
The first two readings were as follows :— 
t 
c. 
a 
8 
Mean. 
m. 
10 
Colourless 
R (6, 0) 
19-85 
15 
55 
R (6, 0) 
19-78 
19-81 
The films were separated. At 27 m the sphere was flooded. The stop-cock was 
opened at 49 m , and the following values of 8 were obtained, beginning at 51 m :— 
8=19-51, 19-54, 19-40, 19'46. 
The last four readings were as follows :— 
t 
a 
a 
8 
Mean. 
h. m. 
1 7 
{lk BR (3, 5)} 
{24k O (1, 5)} 
19-55 
12 
{15, Y (3, 5)} 
All black 
19-65 
17 
{1-55, G (3, 2)} 
55 
19-49 
22 
{2k B (3, 7)} 
55 
19-55 
19-56 
In this case the liquid ring did not disappear when the black reached the bottom. 
c?T/T= —0*025/3-7= — 0"68 per cent. 
