in the length of the pendulum vibrating seconds . 457 
August 10, A. M. Portsoy .-— 1st. Series. 
Clock gaining 37', 63. Barometer 30,10 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. 
58,7 
59,0 
h . m . s . 
7.30.24 
38.22 
46.20 
54.19 
8. 2.19 
10.18 
18.17 
26.17 
34.16 
42.15 
50.15 
1°20 
1,16 
1,10 
1,06 
1,01 
0,96 
0,93 
0,89 
0,85 
0,82 
0,80 
O 
1,18 
1,13 
1,08 
1,03 
0,98 
0,94 
0,91 
0,87 
0,83 
0,81 
478 
478 
479 
480 
4?9 
479 
480 
479 
479 
480 
S. 
2,29 
2,09 
1,91 
1,74 
1,57 
1,45 
1,36 
1,24 
1,13 
1,08 
58,8 
Mean 
479,1 
477,1 
86076,80 
1,59 
86078,39 
August 10, P. M. Barometer 30,16 inches. 
59.8 
60.8 
1.26.11 
34. 8 
42. 6 
50. 4 
58. 2 
2. 6. 0 
13.58 
22.56 
30.56 
38.54 
45.52 
1,18 
1,13 
1,08 
1,04 
0,99 
0,95 
0,91 
0,87 
0,84 
0,81 
0,79 
1,15 
1,10 
1,06 
1,01 
0,9? 
0,93 
0,89 
0,85 
0,82 
0,79 
47 7 
478 
478 
478 
478 
4? 8 
478 
480 
4 ?S 
478 
2.17 
1,98 
1,84 
1,67 
1,54 
1,42 
1,30 
1.18 
1,10 
1,03 
60,3 
Mean 
478,1 
476,1 j 86076,04 
1,52 
86077,56 
