acceleration of the pendulum in different latitudes. 185 
ing preceded the comparison within half an hour. The rate of 
259 on mean time from one noon transit to the next, and from 
one midnight transit to the next, being added (as the rate 
was always gaining) to the gain of each clock on 259 in the 
corresponding interval, showed the gain of the clocks respec- 
tively on mean time, as deduced from transits of the sun. 
2nd. Clock 1 was compared at nine minutes, and clock 2 
at eleven minutes, after a star had been observed to pass the 
middle wire of the transit; the gain of 259 between the tran- 
sits of the star being applied, as before, to the gain of the 
clocks on the chronometer, their rates were obtained in the 
intervals of sidereal time. 
The temperatures were registered every hour, and the arcs 
of vibration every third hour : the temperatures were occa- 
sionally noted by the serjeant of artillery, the arcs always by 
myself. 
The results in one view of the Tables A. B. and C. are as follow ; 
By Transits of 
Vibrations 
per diem. 
Clock 1. 
Clock 2. 
The Sun, S. of the Zen. mean of 18 daiys 
86466,273 
86571,683 
The Sun, N. of the Zen. mean of 19 days 
86466,336 
86571,677 
Capella, N. of the Zen. mean of 16 days 
86466,346 
86571,721 
a Lyrae, S. of the Zen. mean of 9 days 
86466,462 
8657C7 8 3 
« Aquilae, S. of the Zen. mean of 5 days 
86466,568 
86571,953 
Arcturus, S. of the Zen. mean of 18 days 
86466,272 
86571,651 
Each result being given a value proportioned to the number 
of days of which it is the average, the means are obtained 
of clock No. 1, 86466,338 vibrations, and of clock No 2, 
86571,7165 vibrations per diem. 
The elevation of the clocks above the sea was ascertained 
