in the length of the pendulum vibrating seconds. 489 
October 24, A. M. Arbury Hill. 
Clock losing 6 s , 20. Barometer 29,57 inches. 
I 
Temp/ 
[ T „. 
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. 
O 
50,7 
51,0 
h. m. s. 
9. 9.14 
1*51 
26.28 
35. 5 
43.42 
52.19 
10 . 0.57 
9.35 
18.12 
27-51 
35.29 
O 
1,17 
1,12 
1,07 
1,03 
0,98 
0,94 
0,90 
0,86 
0,82 
0,78 
0,75 
O 
1,14 
1,09 
1,05 
1,00 
0,96 
0,92 
0,88 
0,84 
0,80 
0,76 
517 
517 
517 
517 
517 
518 
51S 
517 
519 
518 
S. 
2,13 
1,95 
1,80 
1,64 
1,51 
1,39 
1,27 
1,16 
1,05 
s 0,94 
50,8 
Mean 
517,5 
515,5 
86059,92 
1,48 
86061,40 
October 2. 
*, P- M. 
Barometer 29,55 inches. 
50,5 
50,8 
1.35. 5 
43.41 
52.17 
2. 0.54 
9.30 
18. 7 
26.44 
35.22 
44. 0 
52.38 
3. 1. 16 
1,22 
1,17 
1,12 
1,08 
1,03 
0,98 
0,94 
0,90 
0,8* 
0,83 
0,79 
1,19 
1,14 
1,10 
1,05 
1,00 
0,96 
0,92 
0,88 
0,85 
0,81 
516 
516 
517 
516 
517 
517 
518 
518 
518 
518 
2,32 
2,13 
1,98 
1,80 
1,64 
1,51 
1,39 
1,27 
1,18 
1,07 
50,6 
Mean 
' 
517,1 
515,1 
86059,65 
1,63 
56061,28 
