192 
DR. H. T. BARNES ON THE CAPACITY FOR HEAT OF WATER 
Group 1. contains the results when the '10-millim. platinum-wire is fused to short 
copper-wires, which in turn are soldered to the leads inside the glass-tubes of the 
thermometers, so that the solder-joins are subject to the temperature change 
0° to 100°. 
Group II. gives the tests when the solder-joins inside the glass-tubes were done 
away with. 
Group III. contains the results in the case when the •10-millim. wire was gold- 
soldered to heavy platinum-wire, which was fused to the copper leads. 
Group 1Y. contains the determination of F.I. in terms of the second box. It comes 
smaller owing to the resistance of the unit being greater than in the first box. 
In Group I. the variation from the mean value is somewhat larger than the 
errors of reading the barometer, amounting in the extreme case to '007°. This was 
attributed to an uncertainty in the solder joins. 
Group I.—Coils 640 + 320 -j- 10 = 969‘876 units. Thermometer E. 
10 units = 1° C. nearly. Box 1. 
Date. 
Bridge-wire 
corrected. 
Total units. 
Barometer 
corrected. 
F.I. corrected to 
76-00 eentims. 
February 24, 1899 .... 
+ 2-964 
972-840 
76-196 
97-2141 
5? .... 
+ 4-597 
974-473 
76-630 
97-2217 
„ 27 „ .... 
-1-396 
968-480 
74-938 
97-2260 
,, 28 „ .... 
-2-022 
967-854 
74-789 
97-2162 
„ 28 „ . . . . 
-2-399 
967-477 
74-683 
97-2160 
Mean . . . 
. . . 97-2188 
Group II.—Coils 640 + 320 -f- 10 = 969'876 units. Thermometer E. 
10 units = 1° C. nearly. Box 1. 
Date. 
Bridge-wire 
corrected. 
Total units. 
Barometer 
corrected. 
F.I. corrected to 
76-00 eentims. 
May 15, 1899. 
+ 3-006 
972-882 
75•9S5 
97-2935 
„ 15 „. 
+ 2-495 
972-371 
75-844 
97-2926 
,, 18 „. 
+ 1-669 
971-545 
75-616 
97-2916 
August 10, 1899. 
+ 1-302 
971-178 
75-492 
97-2991 
„ 10 .. 
+ 1-279 
971-155 
75-485 
97-2993 
September 11, 1899. . . . 
+ 2-320 
972-196 
75-792 
97-2939 
„ 11 „ . . . . 
+ 2-211 
972-087 
75-760 
97-2944 
„ 21 „ . . . . 
+ 0-670 
970-546 
75-314 
97-2993 
Mean . . . 
. . . 97-2955 
