in the length of the pendulum vibrating seconds. 447 
July 23, P. M. at Unst. 
Clock gaining 50’, 63 in a mean solar day. Barometer 30,0 
inches. 
Temp . 
Time of Coin- 
cidence. 
Arc 
of vibra. 
tion. 
Mean 
Arc . 
I nterval 
in 
Seconds. 
No. of 
vibrations. 
Observed 
vibrations 
in 24 hours. 
Correc- 
tion for 
Arc. 
Vibrations 
in 24 hours. 
58,0 
58,8 
h . m . S . 
0. 44.47 
52.48 
1. 0.49 
8.52 
16.54 
24.57 
32.59 
41. 2 
49. 5 
57- 8 
2. 5.10 
O 
1,25 
1,18 
144 
1,08 
1,03 
0,98 
0,93 
0,90 
0,85 
0,82 
0,78 
O 
1,21 
1,16 
1.11 
1,05 
1,00 
0,95 
0,91 
0,87 
0,83 
0,80 
481 
481 
483 
482 
483 
482 
483 
483 
483 
482 
s. 
2,40 
2,20 
2,02 
1,80 
1,64 
1,48 
1,36 
1,24 
1,13 
1,05 
58,4 
Mean 
482,3 
480,3 
86092,15 
1,63 
86093,78 
July 23, P. M. Barometer 30,3 inches. 
58.8 
59.8 
2. 9.54 
17-55 
25.5 6 
33.57 
41.58 
50. 0 
58. 1 
3. 6. 3 
14. 5 
22. 7 
SO . 9 
1,21 
1,16 
1,11 
1,06 
1,01 
0,97 
0,94 
0,90 
0,85 
0,82 
0,79 
1,18 
1,13 
1,08 
1,03 
0,99 
0,95 
0,92 
0,87 
0,83 
0,80 
481 
481 
481 
481 
482 
481 
482 
482 
482 
482 
2,28 
2,10 
1,91 
1,74 
1,61 
1,48 
1,39 
1,24 
1,13 
1,05 
59,3 
Mean 
481,5 
479,5 
86091,55 
1,59 
86093,14 
