778 PROF. W. H. MILLER ON THE CONSTRUCTION OF THE NEW STANDARD POUND. 
The observations for determining the freezing-points of C and D gave, — 
C. 
D. 
1845, March 
... 0-00 
0‘05 in snow. 
1846, December 
... 0-01 
0"08 in snow. 
1855, May 
... 0-02 
0‘07 in ice. 
1855, July 
... 0-00 
0’08 in ice. 
Means in 1855 ... 
... 0-01 
0-07 
Comparisons of C and D with K in March and May 1855. 
No. of comparisons. C. K. 
D. 
No. of comparisons. C. 
K. D. 
10 
6-047 6-004 
6-064 
33 
17-000 
17-056 17-030 
6 
7-780 7-772 
7-783 
24 
18-000 
18-062 18-032 
5 
10-314 10-316 
10-310 
11 
20-161 
20-268 20-228 
10 
13-097 13-137 
13-098 
17 
24-955 
25-079 25-086 
24 
16-000 16-042 
16-037 
t. 
f-K. 
K-C. 
^-C. 
K-D. 
f-D. 
0 
0-000 
— 0-010 
-0-070 
6 
-0-004 
-0-043 
— 0-047 
-0-060 
— 0-064 
8 
— 0-005 
— 0-008 
— 0-013 
-0-011 
— 0-016 
10 
— 0-006 
+ 0-002 
— 0-004 
+ 0-006 
0-000 
13 
-0-008 
+ 0-040 
+ 0-032 
+ 0-039 
+ 0-031 
16 
-0-009 
+ 0-042 
+ 0-033 
+ 0-005 
—0-004 
17 
— 0-010 
+ 0-056 
+ 0-046 
+ 0-026 
+ 0-016 
18 
— 0-010 
+ 0-062 
+ 0-052 
+ 0-030 
+ 0-020 
20 
-0-011 
+ 0-107 
+ 0-096 
+ 0-040 
+ 0-029 
25 
-0-014 
+ 0-124 
+ 0-110 
-0-007 
-0-021 
t. 
t-C. t-T). 
t. 
f-C. 
f-D. 
t. 
f-C. f-D. 
0 
— 0-01 —0-07 
9 
-0-01 
— 0-01 
18 
+ 0-05 +0-02 
1 
— 0-02 —0-07 
10 
0-00 
0-00 
19 
+ 0-07 +0-02 
2 
-0-03 -0-07 
11 
+ 0-01 
+ 0-01 
20 
+ 0-10 +0-03 
3 
-0-03 —0-07 
12 
+ 0-02 
+ 0-02 
21 
+ 0-10 +0-02 
4 
_0-04 —0-07 
13 
+ 0-03 
+ 0-03 
22 
+ 0-10 +0-01 
5 
-0-04 -0-06 
14 
+ 0-03 
+ 0-02 
23 
+ 0-10 0-00 
6 
— 0-05 —0-06 
15 
+ 0-03 
+ 0-01 
24 
+ 0-11 —0-01 
7 
— 0-03 —0-04 
16 
+ 0-03 
0-00 
25 
+ 0-11 -0-02 
8 
-0-01 -0-02 
17 
+ 0-05 
+ 0-02 
The zero-points of C and 
D do not 
appear to have undergone 
any very appreciable 
change. The comparisons of B, C, D with each other at distant intervals may, there- 
fore, be used to check the values of the depression of the zero of B deduced from the 
observations of the freezing-point in 1845, 1846 and 1855. 
Comparisons of C, B, D, July 31, 1846. 
No. of comparisons. 
C. 
B. 
n. 
10 
20-492 
20-769 
20-620 
10 
19-697 
19-969 
19-805 
10 
20-707 
20-977 
20-841 
10 
18-347 
18-589 
18-425 
Mean of 40 comparisons .. 
. 19-810 
20-076 
19-923 
Hence, at 20°, 
B-C=:-l-0-266, 
B— D=-l-0-153. 
