374 Capt. Kater's experiments for determining the variation 
The number of stars observed, and the intervals between 
the transits being employed as before to obtain a mean, we 
have 86062,02 vibrations by the stars, and 86061,99 by the 
sun, whence we obtain 86062,01 for the final mean number of 
vibrations in 24 hours. 
The height of the barometer being 29,23 inches, and the 
thermometer 55°,o the resulting correction for the buoyancy 
of the atmosphere is 5,94. 
The height of Clifton Beacon, above the level of the sea is 
stated in the “ Account of the Trigonometrical Survey" to be 
417 feet; and by levelling, the pendulum was found to be 78 
feet below Clifton Beacon, the height of the pendulum there- 
fore above the level of the sea was 339 feet, the correction 
for which is 1,40 x = 0,95. 
Applying these corrections, we obtain 86068,90 for the 
number of vibrations at Clifton, in a mean solar day, in vacuo 
and at the level of the sea. 
Operations at Arhury Hill. 
On the 13th of October I left Clifton, having previously 
made some important observations for the latitude, which will 
be detailed in the proper place, and proceeded to Arbury Hill, 
where my party and instruments arrived on the 13th. Here 
I procured accommodations at a house belonging to Mr. Gos- 
sage, situated on the side of an eminence, to the south of 
Arbury Hill. The season was now so far advanced, and the 
weather in consequence so variable, that it was not until the 21st 
that I was able to commence my observations. These though 
few in number, were made with such minute precautions, and 
under such favourable circumstances, as to be perfectly satis- 
factory to me. The following Tables contain the results. 
