experiments made with an invariable pendulum. 
15 
Observations of Coincidences at Greenwich, April 1824. 
Height above the level of the sea 181,5 feet. 
A . 20th April, Royal Observatory, 
ck losing at a mean rate 3 s . 29. 
Barometer \° 0 f g } 30.20 mean. 
Time of 
Disappear- 
ance. 
Time of 
Re- appear- 
ance. 
Mean of Dis- 
appearance 
and Re-ap- 
pearance. 
Arc of 
vibra- 
tion. 
Mean 
Arc. 
Interval in se- 
conds of Clock. 
Observed vibrations in 24 h. 
Correct, 
for Arc. 
Observed vibra, corr. for Arc. 
Disappearance. 
Disappearance 
and Re-app. 
Disappearance. 
Disappearance 
and Re-app. 
Disap. 
Disap. & 
Re-ap. 
h. m, s. 
ZD. S. 
ID. 8. 
O 
O 
S. 
S. 
I 29 4 
29 8 
29 6 
1. 18 
1. 140 
693 
693 
vib. 
2.125 
4° 37 
40 41 
40 39 
1. 10 
I.060 
693 
693*5 
I.838 
52 10 
52 15 
52 12,5 
1.02 
0.980 
692 
693*5 
I.571 
2 3 42 
3 5° 
3 46 
O.94 
O.905 
695 
695 
1-339 
15 1 7 
15 25 
15 21 
O.87 
0.845 
694 
694 
1.168 
26 51 
26 59 
26 55 
0.82 
0.790 
696 
696 
1.021 
38 27 
38 35 
38 31 
O.76 
O.740 
693 
693»5 
0.896 
50 00 
50 9 
5° 4*5 
O.72 
0.695 
697 
697*5 
0.790 
3 3 37 
* 47 
1 42 
O.67 
0.650 
695 
695 
0.691 
13 12 
13 22 
13 17 
O.63 
Mean. 
694,22 
694*55 
86147,81 
86147,92 
1.27 
86149,08 
86149,19 
. [. 2 1 st April, Royal Observatory. 
I k losing at a mean rate 3 S .29. 
Barometer {^"“f } 30.00 mean. 
8 33 20 
33 
25 
33 22,5 
1.17 
44 59 
45 
5 
45 2 
1.08 
56 37 
56 44 
56 40,5 
0.99 
9 8 17 
8 
25 
8 21 
0.92 
19 56 
20 
5 
20 0,5 
0.86 
3i 35 
3i 
45 
31 40 
0.82 
43 13 
43 
25 
43 19 
0.76 
54 52 
55 
5 
54 58*5 
0.70 
0 6 34 
6 
43 
6 38,5 
0 .66 
18 10 
18 
23 
18 16,5 
0.61 
I. I25 
1-035 
0.955 
0.89c 
0.840 
0.790 
0.730 
0.680 
0.635 
'< Mean. 
699 
698 
700 
699 
699 
698 
699 
702 
696 
698,89 
699>5 
698.5 
700.5 
699>S 
699.5 
6 99 
699,5 
700 
698 
699*33 
86 49,47 
86149,62 
2.070 
i-753 
1.492 
1.295 
, - I 54 
1. 021 
0.873 
0.757 
0.661 
1.23 
86150,70 
86150,85 
