42G 
MR. E. H. GRIFFITHS ON THE VALUE OF 
similar in construction and dimensions that the result of such changes would be nearly 
the same in both. Thus the differences of temperature deduced from the readings 
would not be altered to any appreciable extent, and it was only with such differences 
that we had to deal. 
(3.) The changes in zero caused by the sudden changes in temperature. 
The history of thermometer 'Eim* was much the same from day to day. During the 
night it remained about the temperature of the tank. Before an experiment, its 
temperature was lowered to 10° C. and, during an experiment, it was steadily raised 
from 10° C. to 25° C., no readings being taken until it reached 13°’9 C. When 
determining the fixed points, the same routine was, as nearly as possible, observed; 
thus the conditions were, in all cases, so alike that the effects were probably similar. 
In any case, we have been unable to detect any irregularities arising from this cause. 
Table XVII.—Values of “ Fixed Points” on Thermometer E,„ when the Temperature 
is Steady. 
C. 
8 7-.5 
13-990 
127 5 
14-965 
177-5 
16-198 
217-5 
17-187 
257-5 
18-180 
297-5 
19-196 
.347-5 
20-474 
397-5 
21-755 
447-5 
23-061 
507-5 
24-662 
537-5 
25-471 
The. following Table shows the difference between the comparative values of the 
ranges when the thermometer is steady and when rising. 
Range E,„. 
Range C. 
Thermom eter steadjn 
Range C. 
Thermometer rising. 
87-5-127-5 
-975 
•973 
1-27-5-177-5 
1 233 
1-235 
177-5-217-5 
-989 
•987 
217-5-257 5 
-993 
•995 
257-.5-297-5 
1-016 
1-016 
297-5-347-5 
1-278 
1-278 
347-5-397-5 
1-281 
1-282 
397-5-447-5 
1-.306 
1-307 
447-5-507-5 
1-601 
1-598 
507-5-537-5 
-809 
-811 
*■ E,„ remained in the calorimeter from the commencement to the close of our work except on tte 
few occasions when water was added or wdthdrawn. 
