672 
ME. H. E. EOSCOE ON A METHOD OF MEASUEING- THE 
June 18th, 1873 (continued). 
Clock. 
Hand. 
Time. 
n. 
Mean 
reading. 
I. 
I 
n 
Time. 
n. j 
Mean 
reading. 
I. 
I 
h m 
h m 
3 30 p.m. 
No obser 
vations. 
3 30 p.m. I 
No obser 
vations. 
4 30 „ 
31-7 
167 
0-30 
0-010 
4 30 „ J 
f 
17-1 
149 
0-51 
0-030 
r 
15 
121 
0-74 
0-049 
5 30 „ \ 
20-2 
112 
0-79 
0-039 
5 30 „ \ 
20 
71 
1-06 • 
0-053 
l 
31-7 
1 
30 
10 
1-68 
0-056 
Mean 
0-035 
Mean 
0-053 
Diff. 
-0-018 
July 1st, 1873. (Protector for first two hours.) 
Clock. 
Hand. 
Time. 
n . 
Mean 
reading. 
I. 
I 
Time. 
n. 
Mean 
reading. 
1 i. 
I 
h m 
5 0 A.M. 
20-2 
160 
0-39 
0-027 
h m 
5 0a.m. I 
| 
No obser vations. 
6 0 „ 
17-1 
143 
0-57 
0-064 
6 0 „ J 
(Henceforward fixed strip A used.) 
f 
1 9 ‘ 6 1 
157 
0-59 
0-061 
f 
10 
152 
0-67 
1 0-067 
7 0 „ \ 
10-2 
155 
0-62 
0-062 
7 0a.m. f 
10 
148 
0-74 
0-074 
1 
m 
118 
1-14 
0-067 
1 
15 
128 
0-94 
0-063 
Mean 
0-063 
Mean 
0-068 
Diff. 
— 0-005 
f 
10-2 
172 
0-31 
0-030 
f 
10 
169 
0-36 
0-036 
8 0 „ \ 
17-1 
■ 165 
0-43 
. 0-025 
8 0 „ 1 
15 
167 
0-39 
0-026 
1 
20-2 
165 
0-43 
0-023 
1 
20 
158 
0-58 
0-029 
Mean 
0-026 
Mean 
0-030 
Diff. 
-0-004 
9 0 „ | 
17-1 
20-2 
160 
146 
0-54 
0-76 
0-032 
0-038 
9 0 „ j 
10 
15 
20 
155 
143 
124 
0-62 
0-79 
0-98 
0-062 
0-053 
0-049 
Mean 
. 0-035 
Mean 
0-055 
Diff. 
-0-020 
f 
5-3 
162 
0-49 
0-092 
f 
5 
154 
0-64 
0-128 
10 0 „ 1 
9-6 
103 
1-32 
0-138 
10 0 „ -l 
10 
90 
1-43 
0-143 
J 
17-1 
10 
2-18 
0-127 
1 
15 
29 
1-98 
0-132 
Mean 
0-119 
Mean 
0-134 
Diff. 
-0-015 
