in the length of the pendulum vibrating seconds. 475 
September 10, A. M. Leith Fort. — 2d Series. 
Clock gaining, 34*, 10. Barometer 29,94 inches. 
Temp. 
Time of coin- 
cidence . 
Arc 
of vibra- 
tion. 
Mean 
Arc. 
Interval 
in 
seconds. 
No. of 
vibrations. 
Observed 
vibrations 
in 24 hours. 
Correc- 
tion for 
Arc. 
Vibrations 
in 24 hours. 
52,1 
52,8 
h. m. s. 
7.59.12 
8. 7-14 
15.16 
23.19 
31.21 
39.24 
47.27 
55.30 
9. 3.33 
11.36 
19.39 
0 
1,15 
1,10 
1,06 
1,02 
0,98 
0,94 
0,90 
0,87 
0,84 
0,80 
0,77 
O 
1,12 
1,08 
1,04 
1,00 
0,96 
0,92 
0,88 
0,85 
0,82 
0,77 
482 
4S2 
483 
482 
483 
483 
483 
483 
483 
483 
S. 
2,06 
1,91 
1,78 
1,64 
1,51 
1,39 
1,27 
1,18 
1,11 
0,97 
52,4 
Mean 
482,7 
480,7 
86075,97 
1,48 
86077,45 
September 10, P. M. Barometer 29,91 inches. 
54.2 
54.3 
1. 8.54 
16.56 
24.57 
32.59 
41. 1 
49. 3 
57. 4 
2. 5. 6 
13. 9 
21.12 
29.14 
1,14 
1,10 
1,04 
1,00 
0,96 
0,93 
0,89 
0,84 
0,81 
0,78 
0,74 
1,12 
1,07 
1,02 
0,98 
0,94 
0,91 
0,86 
0,82 
0,79 
0,76 
482 
481 
482 
482 
482 
481 
482 
483 
483 
482 
2,06 
1,88 
1,71 
1,57 
1,45 
1,36 
1,21 
1,10 
1,02 
0,94 
4,2 
Mea n 
482 
480 
36075,45 
1,53 
36076,98 
— 
3 Q 
MDCCCCXIX 
