experiments made with an invariable pendulum , &c. 319 
From the above details are obtained the following results, 
Vibrations of the Pendulum at Paramatta. 
1st Series. 
Date. 
Barom. 
Thermo- 
meter. 
Vibrations in 
24 hours. 
Correction 
for Tem- 
perature. 
Vibrations in 
24 hours at 
60 degrees. 
Aug. 27 
28 
29 
30 
31 
Sept. 1 
2 
3 
4 
Inches 
29,55 
26,60 
29,70 
29,67 
29,52 
29,86 
29,86 
29,73 
29,80 
29,64 
0 
53,2 
52.0 
52.1 
53.5 
58.2 
55,9 
54,0 
57,8 
55.5 
60.5 
56018.16 
86018,10 
86018,3S 
86017,39 
86016,89 
86015,20 
S6017,74 
S6017,01 
S6017,10 
86015.17 
— 2,SS 
3,38 
3,34 
2,75 
0,76 
1,73 
2,54 
0,93 
1,90 
+ 0,21 
86015,28 
86014,72 
86015,04 
86014,64 
86016,13 
86013,47 
86015,20 
86016,08 
86015,20 
S6015,19 
Mean 
29,69 
55,27 
85015,10 
The mean height of the barometer during these experi- 
ments was 29,69 inches, and the mean temperature 55°, 27, 
from which, and the specific gravity of the pendulum, we 
have 6,49 for the correction on account of the buoyancy of 
the atmosphere. 
Adding this to the mean number of vibrations before found, 
we obtain 86021,59 for the number of vibrations which 
would be made by the pendulum at 6o° in a vacuum in a 
mean solar day. 
In addition to the experiments already given, Sir Thomas 
Brisbane has forwarded another series made at Paramatta 
with the same pendulum, by Mr. Dunlop, a gentleman of 
whose zeal and scientific abilities Sir Thomas Brisbane ex- 
presses himself in the highest terms. 
The following are the details. 
