in the length of the pendulum vibrating seconds. 359 
By the Stars, Portsoy — ist Series. 
From 
To 
Computed 
Vibrations 
in a mean 
solar day. 
Mean of 
Transits B 
or A coinci. 
dences. 
Correc- 
tion. 
Corrected 
Vibrations in a 
mean solar day. 
No. of 
Stars 
observed. 
Inter. 
of 
Transits. 
August. 
August. 
h. m 
6 A.M. 
8 P. M. 
86079,50 
B. 1.17 
+ 0,08 
86079,58 
4 
3 
6 A.M. 
10 P. M. 
86079,63 
B. 1. 17 
+ 0,08 
86079,71 
5 
S 
6 A.M. 
11 P. M. 
86079,69 
B. 1. 14 
+ 0,08 
86079,77 
6 
6 
6 A.M. 
12 P. M. 
86079,62 
B. 1. 13 
+ 0,08 
86079,70 
6 
7 
7 A.M. 
8 P. M. 
86079,44 
B. 2.23 
+ 0,16 
86079,60 
1 
2 
9 A.M. 
10 P. M. 
86079,81 
B. 1.42 
+ 0,10 
86079,91 
6 
2 
9 A. M. 
11 P. M. 
86079,8 I 
B. 1.49 
+ 0,11 
86079,92 
5 
3 
9 A. M. 
12 P. M. 
86079,65 
B. 1.50 
+ 0,11 
86079,76 
5 
4 
11 A.M. 
11 P. M. 
86079,86 
B. 1.50 
+ 0,11 
86079,97 
7 
1 
11 A.M. 
12 P. M. 
86079,61 
B. 2.18 
+ 0,14 
86079,75 
8 
2 
12 A. M. 
12 P. M. 
86079,30 
B. 1. 31 
+ 0,09 
86079,39 
8 
1 
By the Sun. ist Series. 
6 P. M. 
7 A. M. 
86079,48 
A. 1.22 
— 0,08 
86079,40 
2 
1 
6 P. M. 
8 A. M. 
86079,48 
A. 1.20 
— 0,08 
86079,40 
2 
2 
6 P. M. 
jo A. M. 
86079,82 
A. 1.21 
— 0,08 
86079,74 
2 
4 
6 P. M. 
12 A, M. 
86079,78 
A. 1. 15 
— 0,08 
86079,70 
2 
6 
7 P. M. 
8 A. M. 
86079,48 
A. 1. 19 
— 0,08 
86079,40 
2 
1 
7 P. M. 
10 A. M. 
86079,93 
A. 1.19 
— 0,08 
86079,85 
2 
3 
7 P.M. 
12 A. M. 
86079,85 
A. 1. 14 
— 0,08 
86079,77 
2 
5 
8 P.M. 
10 A. M. 
86080. 14 
A. 1.20 
— 0,08 
86080,06 
2 
2 
8 P. M. 
12 A. M. 
86079,93 
A. 1. 13 
—0,08 
86079,85 
2 
4 
10 P. M. 
12 A. M. 
86079,73 
A. 1. 4 
— 0,07 
86079,66 
2 
2 
By using the number of stars observed and the intervals 
between the transits, to obtain a mean, in the manner de- 
scribed in the account of the experiments at Unst, we have 
86079,74 vibrations by the observations of the stars, and 
86079,73 by those of the sun; whence is derived 86079,74 
for the final mean number of vibrations in 24 hours. 
The height of the pendulum at Portsoy, above low water, 
was found by levelling to be 94 feet, the correction due to 
which is 0,39 x = °> 2 3> 
* It may be necessary to remark, that no allowance has been attempted for any 
variation of density between the different stations, but solely for their form. 
