BETWEEN THE FREEZING AND BOILING-POINTS. 
233 
Flow, '598 gramme per second. 
Time in seconds, after 
breaking electric current. 
Temperature of outflow 
thermometer. 
0 
8-375 
35 
3-968 
54 
1-721 
73 
0-574 
101 
0-237 
159 
0-008 
187-5 
0-002 
202-5 
o-ooo 
a — -0386 
C = 50 -5 joules. 
Flow, '392 gramme per second. 
Time in seconds, after 
breaking electric current. 
l 
Temperature of outflow 
thermometer. 
0 
8-068 
48 
3-646 
77 
1-400 
114 
0-264 
152 
0-142 
179 
0-032 
228 
o-oio 
266 
0-005 
299 
0-003 
320 
o-ooo 
a= -0311 
C = 54 joules. 
The logarithmic relation can of course hardly be said to hold with accuracy, or to 
be even approximately true for the relation between the fall in temperature and time, 
as given by the above series of readings, on account of the sudden descent of the 
temperature during the first two minutes. For changes in temperature in the out¬ 
flowing water, occasioned by a change in the electrical supply or flow, greater than 
‘02° during the 15-minute intervals, the thermal capacity as calculated by tbe above 
relation is of sufficient accuracy for the application of a small correction. It was 
seldom that the variation in temperature of the outflowing water amounted to more 
than *02° during a set of readings, and was nearly always less than - 01° for the 
small flows. 
2 H 
VOL. CXCIX.—A. 
