COMPARISON OF T WITH Sp AND RS. 
815 
The resulting values of AT and log AT are; 
AT. 
log AT. 
21-1661 
1-325642 
21-1661 
1-325641 
21-16.56 
1-325631 
21-1667 
1-325654 
Mean 
21-1661 
1-325642 
] 0— -log AT 
8-674358 
T (reduced) 
5759-471 
3-760383 
vT 
272-108 
2-434741 
Hence the volume of T at 0° is equal to the volume of 272' 108 grains of water at 
its maximum density. 
The resulting values of log AT by Schumacher’s Tables are : — 
log AT. 
1-325653 
1-325651 
1-325642 
1-325664 
Mean log AT 
1-325664 
10 — log AT 
8-674336 
T (reduced) 
5759-471 
3-760383 
vT 
272-094 
2-434719 
Hence, using Schumacher’s Tables, the volume of T at 0° is equal to the volume 
of 272*094 grains of water at its maximum density. 
Comparison ofT with Sp and RS. 
In December 1844 T was reduced till its weight was very nearly equal to that of 
Sp, and afterwards compared with Sp and RS. The weights of the two scale-pans 
are denoted by X and Y. The thermometers C, D were suspended in the balance 
case with their bulbs in a horizontal plane passing through the middle of the weights. 
F is the reading of Ernst’s barometer, E that of the attached thermometer. The 
comparisons were made in a cellar under the north side of the Mineralogical Museum 
in Cambridge. The balance was placed upon a thick stone slab forming the sill of 
a recess containing a window so situated, that the lowest part of the window was 
considerably higher than the top of the balance case. 
January 15, 1845. 
T+X. 
Sp+Y. 
100 parts = 0-16949 grain. 
T+Y. 
Sp+X. 
17-14 
15-95 
D= 9-93 
18-50 
17-70 
18-27 
16-50 
C= 9-90 
19-15 
18-31 
18-82 
17-97 
F= 754-8 
19-00 
18-50 
19-44 
17-56 
E= 7-7 
18-53 
18-66 
20-17 
18-01 
18-45 
18-31 
93-84 
85-99 
93-63 
91-48 
5(T-fX)£t5(Sp-|-Y)-|-7'85 parts. 5(T-|- Y)£b5(Sp-|-X) + 2'15 parts. 
10T^10Sp + 0"Ol695 grain in air (<=9*91? i=754‘30). 
