experiments made with an invariable pendulum 
17 
Observations of Coincidences at Greenwich — continued. 
Height above the level of the sea 181,5 feet. 
P. M. 22d April 1824, Royal Observatory. 
Clock losing at a mean rate y.29. 
Barometer 
femp. 
59-5 
Time of 
Disappear- 
ance. 
h. m 
I 
5i,o 
30,2 
2 9 55 
41 25 
52 56 
4 28 
! 5 59 
2 7 3i 
39 4 
5° 37 
2 8 
13 42 
Time of 
Re-appear- 
ance. 
29 59 
4 1 30 
53 2 
4 35 
16 7 
27 40 
39 12 
50 48 
2 20 
*3 52 
Mean of Dis 
appearance 
and Re-ap- 
pearance. 
ra. s. 
29 57 
41 27,5 
5 2 59 
4 3i,5 
16 3 
27 35>5 
39 8 
50 42,5 
2 14 
J 3 47 
Arc of 
vibra- 
tion. 
1.20 
1.12 
I.04 
O.96 
O.89 
O.83 
O.77 
O.72 
o 67 
O.62 
Mean 
Arc. 
1. 1 60 
I.080 
I. OOO 
O.925 
O.860 
O.80O 
O.745 
0.695 
0.645 
Mean. 
Interval in se- 
conds of Clock. 
Disap. 
690 
691 
692 
691 
692 
693 
693 
691 
694 
691,89 
Disap. & 
Re-ap. 
8. 
690.5 
691.5 
692.5 
6 9 !,5 
692,5 
692.5 
6 94.5 
691.5 
693 
692,22 
Observed vibrations in 24 h. 
Disappearance. 
86146,97 
Disappearance 
and Re-ap 
86147,09 
Correct, 
for Arc. 
vib. 
2.200 
I.908 
I-635 
I.400 
1.210 
I.O46 
O.908 
O.79O 
0.681 
i-3 1 
Vibra. in 24 h. corr. for Arc. 
Disappearance 
86148,28 
Disappearance 
and Re-app. 
86148,40 
A. M. 23d April 1824, Royal Observatory. 
Clock losing at a mean rate 3 3 .29. 
3» 8 
8 47 21 
47 25 
47 23 
1. 18 
M35 
i,°55 
698 
698 
699 
700 
699 
699 
701 
700 
701 
698 
699 
700 
699 
699-5 
700 
700,5 
700,5 
701 
2.107 
1 .820 
5 8 59 
59 3 
59 1 
1.09 
# 
9 10 37 
10 43 
10 40 
1.02 
0,985 
0,920 
0,865 
0,8 10 
1.587 
r.384 
1.224 
1.073 
0.932 
0.824 
0.724 
22 16 
22 24 
22 20 
0.95 
34 56 
35 2 
34 59 
0.89 
46 35 
46 42 
46 38,5 
0.84 
57 H 
57 23 
57 18,5 
0.78 
o,755 
0,710 
10 8 55 
9 3 
8 59 
°-7 3 
20 35 
20 44 
20 39-5 
0.69 
0,665 
3-9 
32 16 
32 25 
32 20,5 
0.64 
3,8 
Mean. 
699-44 
699,72 
86149,67 
86149,76 
1.30 
86150,97 
8615 1,06 
* 
D 
MDCCCXXVI. 
