240 CAPTAIN SABINE ON THE DIFFERENCE IN THE NUMBER OF 
Greenwich, August 1829 ; Experiments with Pendulum 12. 
Aug. 8 
Therm. 
. 63.87 • • 
Barom. 
30.102 62.5 . 
Vibrations. 
. 85959.22 . . 
Corrected to 63.53. 
85959.37 
8 
. 65.53 . . 
30.072 64.5 . 
. 85958.41 . . 
85959.29 
9 
. 62.50 . . 
29.988 62.0 . 
. 85959.76 . . 
85959.31 
9 
. 64.45 . . 
29.951 65.0 . 
. 85959.24 . . 
85959.64 
9 
. 64.95 . . 
29.908 66.5 . 
. 85959.04 . . 
85959.66 
10 
. 62.90 . . 
29.806 62.0 . 
. 85959.63 . . 
85959.35 
10 
. 63.55 . . 
29.829 63.5 . 
. 85959.29 . . 
85959.30 
11 
. 61.50 . . 
30.020 60.0 . 
. 85960.2 7 • • 
85959.38 
11 
. 62.50 . . 
30.047 62.0 . 
. 85959.79 . . 
85959.34 
63.53 
29.970 63.0 
85959.404 
— .090 red", to 32°. Red", for 29.9 in. 
+ .019 capillary. of air at 63 .5 
| + 9.926 
29.900 at 32°. 
Mean 
85969.33 
The two results then at Greenwich are as follows : 
July 
1828 . 61.50 
Vibrations. 
. 85970.00 . 
Corrected to 62.5 = 
Vibrations. 
85969.56 
August 1829 . 63.53 
. 85969.33 . 
Corrected to 62.5 = 
85969.78 
62.5 
Mean 
85969.67 
In Altona the pendulum is vibrated in an apartment on the ground floor of 
M. Schumacher’s house, appropriated to pendulum experiments. The door of 
this apartment is double, and the windows are double sashed, for the purpose 
of preserving an uniform temperature : a strong mahogany plank is fixed 
securely to the wall. The agate planes were screwed on it, and the telescope 
for observing coincidences was stationed in an aperture made for the purpose 
in the wall opposite to the pendulum, so that the coincidences were observed 
without entering the room. The clock for observing coincidences, with which 
M. Schumacher was so kind as to supply me, was Breguet, No. 3405, the ad- 
mirable going of which during five centuries has recently been published. The 
