in the length of the pendulum vibrating seconds , 455 
August 8, A. M. Portsoy.— 1st. Series. 
Clock gaining 37* ,63. Barometer 30,05 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. 
58,6 
59,0 
h. m. s. 
7.39.46 
47-48 
55.51 
S. 3.54 
11.58 
20. 1 
28. 5 
36. 8 
44.12 
52.16 
9. 0.20 
0 
1,21 
1,15 
1,12 
1,06 
1,02 
0,98 
0,94 
0,90 
0,86 
0,83 
0,79 
0 
1,1S 
1,13 
1,09 
1,04 
1,00 
0,96 
0,92 
0,88 
0,84 
0,81 
482 
483 
483 
484 
483 
484 
4S3 
484 
484 
484 
S. 
2,28 
2,10 
1,95 
1,77 
1,64 
1,51 
1,39 
1,27 
1,16 
1,08 
58,8 
Mean 
483,4 
481,4 
860SO,00 
1,61 Js6081,61 
August 8, P. M. Barometer 30,09 inches. 
\ 
60,0 
61,1 
1. 4.28 
12.31 
19.33 
27-35 
36.38 
44.41 
52.54 
2. 0.48 
8.51 
16.54 
24.57 
1,16 
1,11 
1,06 
1,02 
0,91 
0,94 
0,90 
0,86 
0,83 
0,79 
0,76 
1,13 
1,08 
1,04 
1,00 
0,96 
0,92 
0,88 
0,84 
0,81 
0,77 
483 
482 
482 
483 
483 
483 
484 
483 
483 
483 
2,10 
1,91 
1,77 
1,64 
1,51 
1,39 
1,27 
1,16 
1,08 
0,97 
60,5 
Mean 
482,9 
480,9 
86079,63 
1,48 
S6081,ll 
Oil was applied to the scapement without stopping the 
clock. 
