358 Capt. Kater’s experiments for determining the variation 
From the detail of the coincidences observed at Portsoy 
given in the Appendix, and from the rate of the clock from 
the 5th to the 12th, is derived the following Table. 
Vibrations of the Pendulum at Portsoy, ist. Series. 
The clock making 86437,63 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. 
29.95 
64,8 
86085,53 
1, 18 
86086,71 
P. M 
30,00 
65,2 
86084,19 
1.35 
86085,54 
A. M 
29,89 
62,3 
86083,09 
0,13 
86083,22 
7 
P. M 
29,88 
62,6 
86082,30 
0,25 
86082,55 
Q 
A. M 
30,05 
58,8 
86081,61 
1 >35 
86080,26 
O 
P. M, 
30,09 
60,5 
86o8l,I I 
0,63 
86080,48 
A. M. 
30,04 
60,4 
86080,1 3 
0,68 
86079,45 
9 
P. M. 
30.04 
60,5 
86078,63 
0,63 
86078,00 
A. M. 
30,10 
58,8 
86078,39 
i .35 
86077,04 
lo 
P. M. 
30,16 
60,3 
86077,56 
0,72 
86076,84 
A. M. 
30,28 
56,6 
86078,44 
2,28 
86076,16 
1 1 
P. M. 
30,27 
60,0 
86077,34 
0,85 
86076,49 
A M. 
30,26 
59 > 2 
86076,92 
1,18 
86075,74 
I 2 
P- M. 
30,27 
61,3 
86076,51 
0,30 
86076,21 
Mean 
• • 
30,09 
60,8 
86079,62 
On examining the preceding Table, it appears that the rate 
of the clock had pretty regularly increased to the surprising 
amount of 10 s , 51 in the space of 7 days; which is an accele- 
ration of i s , 5 in every 24 hours ; on this I shall have occa- 
sion to remark hereafter. From the foregoing data the fol- 
lowing Table of the corrected vibrations of the pendulum in 
a mean solar day was computed, in the manner which has 
been before detailed. 
