194 
DR. H. T. BARNES ON THE CAPACITY FOR HEAT OF WATER 
Summarizing we have the F.I.’s of thermometer E, as measured by the two boxes, 
as follows :— 
Group I.—97'2188 measured with 1st box. 
55 55 55 
55 55 55 
„ 2nd „ 
This gives the corrections to be applied to the readings to make 100 10-units 
equal to 100° on the platinum scale : 
Group 1.—2'8610 per cent. Group III.— 27324 per cent. 
„ II.—27795 „ .„ IV.—10-4962 
The difference in the corrections, with the exception of Group IV., is due to the 
change in the lengths of the thermometer wire in changing the leads. No change 
was made to the thermometers themselves between Groups III. and IV. 
The various tests on the other thermometers are given now as under. With 
thermometer D no difference could be noted in the F.I. measured with 80 ohms 
in the external circuit, or with 50 ohms. The tests with thermometer A are 
important as illustrating the results to be obtained from silk-covered wire thermo¬ 
meters, and also as they were the thermometers used in the mercury experiments. 
Thermometer A. Box 1. 
Date. F.I. corrected. 
May 22, 1897 .. . 99'9327 
„ 24 „. 99'9245 
II.—97'2955 
III. —97-3403 
IV. —90-5009 
With thermometer C, also silk-covered thermometers, the tests are not so 
satisfactory. 
Thermometer C. 
Date. 
F.I. corrected. 
Date. 
F.I. corrected. 
April 30, 1898 . 
. . 101-4031 
July 11, 1898 . 
• 
101-3908 
May 2 „ . 
. . 101-3931 
August 8 ,, 
• --—--- 
101-4006 
