244 CAPTAIN SABINE ON THE DIFFERENCE IN THE NUMBER OF 
The rate at Greenwich, with which this rate at Altona is to be compared, is 
851)69.67 vibrations at G2°.5. Reducing both these rates to a mean tempera- 
ture of 60°, in the proportion of 0.44 vibration to one degree of Fahrenheit, 
they become respectively 85979.77 at Greenwich, and 85979.10 at Altona: 
w hence we have an acceleration at Altona of 8.33 vibrations per diem. 
Table A. — Vibrations of Pendulum 12 at Greenwich, August 1829; on the 
fixed iron support in the Pendulum room. The Barometer employed was the 
standard barometer of the Royal Observatory ; the Thermometer was Cap- 
tain Sabine’s standard thermometer ; the Arc was the same that had been 
used at Greenwich in July 1828 ; and at Altona in September and October 
1828. 
f 20 1 1 Q 1 
ExP. 1. August 8 th. Clock making 86309.45 Vibrations. Barom. < r 30.102 in. 62°.5. 
No. of 
Coincid. 
Therm. 
Times of 
Arc. 
Mean 
Therm. 
Mean 
Interval. 
Correction 
for Arc. 
Vibrations in 24 
hours. 
Disapp. 
Reapp. 
Coincidence. 
1 
33 
45 
6f.3 
66.0 
64.3 
m s 
27 19 
m s 
27 23 
h m s 
7 27 21 
12 0 0 
1 28 29 
0.85 
0.12 
1 
63.87 
s 
492.46 
s 
+ 0.30 
85959-22 
28 22 
28 36 
ExP. 2 . August 8 th. Clock making 86309.73 Vibrations. Barom. ^gg'ooo} ^ 0. 072 in. 64 <°. 5 . 
I 
41 
64.4 
67.1 
65.1 
m s 
37 11 
m s 
37 17 
h m s 
1 37 14 
3 0 0 
7 4 29.5 
0.86 
0.14 
65.53 
s 
490.89 
s 
+ 0.31 
85958.41 
4 14 
4 45 
Exp. 3. August 9th. Clock making 86309.73 Vibrations. Barom. |o^ '^ 73 } 29.988 in. 62°. 
1 
29 
O 
61.7 
63.3 
m s 
4 51 
54 47 
m s 
4 57 
55 00 
h m s 
8 4 54 
11 54 53.5 
0.72 
0.20 
} 62.5 
r 
s 
492.84 
s 
+ 0.30 
85959-76 
Exp. 4. August 9th. Clock making 86309.70 Vibrations. Barom. ( 29.951 in. 65°. 
1 /ci/.you 1 
1 
27 
O 
1 63.4 
1 65.5 
m s 
3 25 
j 36 34 
m s 
3 30 
36 45 
h m s 
12 3 27.5 
3 36 39.5 
0.80 
0.23 
^ 64.45 
s 
490.0 
+0.39 
85959.24 
