382 Capt. Kater’s experiments for determining the variation 
By the San. 
Icorrect vibrations fsfn of ctarc 
Inter, of 
From 
To 
in a mean solar 
observed. 
Transits. 
day. 
1 1 P. M. 
13 A. M. 
8605 1,54 
2 
2 
11P. M. 
14 A. M 
86051,47 
2 
3 
11 P. M. 
15 A. M. 
86051,37 
2 
4 
11 P. M. 
16 A. M. 
8605 1,36 
2 
5 
13 P. M 
14 A. M. 
8605 1,3 T 
2 
1 
13 P. M. 
15 A. M 
8605 1, ZO 
2 
2 
13 P. M. 
16 A. M 
8605 1,24 
2 
3 
14 P. M. 
15 A. M. 
8605 1,08 
2 
1 
14 P. M. 
16 A. M. 
86051,22 
2 
2 
15 P. M. 
16 A. M. 
86051,34 
2 
1 
The number of stars observed and the intervals between 
the transits being employed as before to obtain a mean, we 
have 86051,28 vibrations by Regulus, 86051,18 by the other 
stars, and 86051 ,34 by the sun ; and the sum of the respective 
factors being 20, 24, and 48 we obtain 86051,28 for the final 
mean number of vibrations in 24 hours. 
The mean height of the barometer being 30,09 inches, and 
that of the thermometer 6o°,9, the correction for the buoyancy 
of the atmosphere is 6,09. 
It may be seen in the Appendix, that the height of Dunnose 
above the summer house, deduced from the distance and 
angle of elevation of the signal post, is 539 feet; and as 
Dunnose is stated, in the Trigonometrical Survey, to be 792 
feet above the level of the sea, this would give 253 feet for 
the elevation of the pendulum above the sea. But by obser- 
vations made with a barometer of Sir Harry Englefield’s 
construction, on three several days, the greatest difference of 
the results being eight feet, the mean elevation of the summer 
house above high water mark appeared to be 221 feet; and 
if 10 feet be allowed for the fall of the tide, we have 231 feet, 
for the height of the pendulum above low water, differing 
