130 
PRESTON. 
edges were measured in the same way and the resulting 
values are thought to be much nearer those that should 
enter into the gravity computations than those heretofore 
attained. 
The following table of corrected swings for pendulum 
No. 4, at the Lick observatory, in 1887, shows the degree of 
accuracy attainable when the conditions are favorable : 
HEAVY END DOWN. 
Name out. 
Name in. 
No. 
Date. 
Epoch. 
Obs. 
Period. 
No. 
Date. 
Epoch. 
Obs. 
Period. 
h. 
s. 
h. 
s. 
1 
Oct. 23.... 
9.1 
P 
1.006603 
9 
Oct. 25... 
8.8 
P 
1.000604 
2 
13.6 
“ 
2 
10 
13.1 
(i 
2 
3 
17.9 
“ 
2 
11 
17.4 
“ 
3 
4 
22.2 
K 
4 
12 
22.2 
K 
4 
5 
Oct. 24.... 
8.7 
P 
* _ 
13 
Oct. 26... 
8.8 
P 
1 
G 
13.2 
U 
3 
14 
13.2 
“ 
2 
7 
17.5 
4C 
1 
15 
17.7 
“ 
1 
8 
22.1 
K 
2 
16 
22.0 
K 
5 
HEAVY END UP. 
Name out. 
Name in. 
No. 
Date. 
Epoch. 
Obs. 
Period. 
No. 
Date. 
Epoch. 
Obs. 
1 
Period. 
h 
s. 
h . 
s. 
1 
Oct. 20.... 
8.3 
P 
1.006495 
11 
Oct. 21... 
8.2 
P 
1.006475 
2 
9.8 
it 
5 
12 
9.7 
“ 
71 
3 
11.3 
C( 
7 
13 
11.2 
« 
73 
4 
12.8 
u 
6 
14 
13.0 
“ 
78 
5 
14.3 
U 
4 
15 
14.5 
“ 
72 
6 
15.9 
(4 
5 
16 
15.0 
“ 
67 
7 
17.3 
5 
17 
17.5 
“ 
72 
8 
18.8 
8 
18 
19.0 
“ 
71 
9 
22.5 
K 
3 
19 
22.2 
K 
79 
10 
0.1 
“ 
8 
20 
23.7 
C< 
78 
* Rejected on account of defective action of clock “trip.” The following swings are 
by a different time-piece. 
