4 <76 Capt. Kater’s experiments for determining the variation 
September 11, A. M. Leith Fort. — 2d Series. 
Clock gaining 34,’, 10. Barometer 29,92 inches. 
Temp. 
Time of coin- 
cidence. 
Arc 
of vibra- 
tion. 
Mean 
Arc. 
Interval 
in 
seconds. 
No. of 
vibrations. 
Observed 
vibrations 
n 24 hours. 
Correc- 
tion for 
Arc. 
Vibrations 
in 24 hours. 
0 
51,3 
51,8 
h. m. s. 
7.58.14 
8. 6.15 
14.17 
22.19 
30.21 
38.24 
46.26 
54.28 
9. 2.31 
10.33 
18.36 
O 
1,17 
1,13 
1,08 
1,05 
1,01 
0,98 
0,94 
0,89 
0,86 
0,82 
0,79 
0 
1,15 
1,10 
1,06 
1,03 
0,99 
0,96 
0,91 
0,87 
0,84 
0,80 
481 
482 
482 
482 
4S3 
482 
482 
483 
482 
483 
S. 
2,16 
1,98 
1,84 
1,74 
1,60 
1,51 
1,36 
1,24 
1,16 
1,05 
51,5 
Mean 
482,2 
480,2 
86075,60 
1,56 
86077,16 
September 11, P. M. Barometer 29,95 inches. 
53,2 
53,5 
1.12. 9 
20.10 
28.11 
36.13 
44.14 
52.16 
2. 0.18 
8.21 
16.23 
24.25 
32.27 
1,14 
1,09 
1,04 
0,99 
0,95 
0,91 
0,88 
0,84 
0,81 
0,78 
0,7'1 
1 1,11 
1,06 
1,01 
0,97 
0,93 
0,89 
0,86 
0,82 
0,79 
0,76 
481 
481 
482 
481 
482 
482 
483 
482 
482 
482 
2,02 
1,84 
1,67 
1,54 
1,42 
1,30 
1,21 
1,10 
1,02 
0,94 
53,3 
Mean 
i 
481,8 
479,8 
86075,30 
1,41 
86076,71 
