in the length of the pendulum vibrating seconds . 
367 
the rate of the clock appeared to be 26 s ,85 ; which rate as it 
was deduced from the longest interval, has been used in com- 
puting the following Table. 
Vibrations of the Pendulum at Leith Fort. ist. Series. 
The clock making 86426,85 vibrations in a mean solar day. 
Date. 
Barometer. 
Thermom. 
Vibrations 
in 24 hours. 
Correction 
for 
Temp. 
Vibrations 
in 24 hours 
at 62 degrees. 
A. M. 
2 9>95 
56,6 
86078,34 
2,28 
86076,06 
J 1 
P. M. 
29,85 
58,9 
86077,50 
1,30 
86076,20 
A.M. 
29,55 
58,7 
86076,08 
1,40 
86074,68 
P. M. 
29,49 
6o,I 
86075,72 
0,80 
86074,92 
A. M. 
29,58 
58,4 
86075,14 
1,52 
86073,62 
P. M. 
29,68 
59>9 
86074,55 
0,89 
86073,66 
A.M. 
29,95 
57’4 
86075,13 
095 
86073,18 
3 
P. M. 
2 9>97 
59>7 
86074,13 
°>97 
86073,1 6 
A. M. 
29,78 
59’5 
86074,13 
1,06 
86073,07 
4 
P. M. 
29,76 
61,9 
86073,16 
0,04 
86073,12 
A. M. 
29,85 
60,3 
86072,43 
0,72 
86071,71 
5 
P. M. 
29,83 
62,1 
86071.57 
+ 0,04 
86071,61 
f . 
A. M. 
29,60 
59>9 
86070,85 
0,89 
86069,96 
P. M. 
29,62 
61,4 
86070,33 
0,25 
86070,08 
Mean 
29 , 7 s 
59 > 6 
86073,21 
By the above Table we may perceive, that though the clock 
had been cleaned so recently, its rate had notwithstanding en- 
creased in seven days, about six seconds, or 0,85 in every 24 
hours. On account of this acceleration it becomes necessary 
to apply a correction, in the manner which has been before 
explained, in order to obtain the true number of vibrations 
made by the pendulum in a mean solar day. The results are 
contained in the following Table. 
