47 8 Capt. Kater’s experiments for determining the variation 
September 13, A. M. Leith Fort. — 2d. Series. 
Clock gaining 34,%! o. Barometer 30,28 inches. 
Temp. 
Time of chin - 
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. 
53,6 
54,4 
h. m. s. 
8.37-37 
45.36 
53.36 
9. 1.37 
9.38 
17-39 
25.40 
33.41 
41.42 
49.42 
57.45 
0 
1,14 
1,09 
1,04 
1,00 
0,96 
0,92 
0,88 
0,84 
0,S1 
0,78 
0,75 
0 
1,11 
1,06 
1,02 
0,9S 
0,94 
0,90 
0,86 
0,82 
0,79 
0,76 
479 
450 
481 
481 
451 
481 
48 1 
481 
481 
483 
S. 
2,02 
1,84 
1,71 
1,57 
1,45 
1,33 
1,21 
1,10 
1,02 
0,94 
54,0 
Mean 
480,9 
478,9 
86074,63 
1,42 
86076,05 
September 13, P. M. Barometer 30,24 inches. 
0 
55,6 
56,3 
1. 7-18 
15.17 
23.16 
31.16 
39.16 
47.17 
55.17 
2. 3.17 
11.18 
19.18 
27-19 
1,12 
1,07 
1,02 
0,98 
0,94 
0,91 
0,87 
0,83 
0,80 
0,77 
0,74 
1,09 
1,04 
1,00 
0,96 
0,92 
0,89 
0,85 
0,81 
0,78 
0,75 
479 
479 
450 
480 
481 
480 
480 
481 
480* 
451 
1,95 
1,77 
1,64 
1,51 
1,39 
1,30 
1,18 
1,08 
1,00 
0,92 
55,0 
Mean 
480,1 
478,1 
86074,03 
1,37 
80075,40 
