180 TC. Mendenhall—Liquids above the edge of a vessel. 
series of measurements was made with seven cups of various 
diameters, the liquid used being pure water at the temperature of 
the room, which was about 70° F. The results are collected in a 
table below. 
No. of véssel. Diameter Height of water 
in inches. heaped in inches, 
] 2°5 “196 
2 1°91 "182 
3 1°28 "190 
4 y 203 
5 42 "182 
6 47 "154 
7 2 “148 
the edge of the vessel. The edges of Nos. 2 and 5 had been slightly 
rounded by fusion; Nos. 6 and 7 decidedly so: while No. 4 had 
Thickness of edge Thickness of e 
No. in inches. No. in inches. 
1 056 4 "045 
2 "048 5 013 
3 "149 6 ‘068 
"025 
7 
In order to test the effect of the thickness of the edge, to the top 
of a circular glass plate, about two inches 
diameter, having a circular opening about two-tenths of an inch in 
diameter in the center, thus forming, in effect, a vessel with an 
edge nine-tenths of an inch broad. The result of several trials 
with this entirely verified the previous conclusion. No. 4 being 
the most perfect cup of all, was selected for the trial of one or two . 
other liquids and also to determine the effect of temperature upo? 
the height to which water might be he . The result in the. 
last case was precisely what might have been expected, as is clearly 
shown in the following three trials: 
Water, 70- ¥, *203 inches. 
¥ 88° F. 18q..58 
Me 135° F. lt Bee 
The difficulty of maintaining, during the measurement, a tempet® 
ture higher than the last given above, prevented me, at the time, 
making any further trials, but the results would, without 
doubt, verify the law indicated above. 
In the same cup, mereury at a temperature of 70° F., was heaped 
to a height of -140 inches; alcohol to a height of 094. In a brass 
