238 
Captain Hall’s details of experiments 
Observation for the Latitude of the Station , viz. S. W. Point of the 
Earl of Abingdon’s Island , Galapagos. 
January 16, 1822. Barom. 29,97 Thermom. 90°. 
Sun on the Meridian by the clock, at 12 h 12 m 34‘,7. 
Face of 
Instrument. 
Times by Clock. 
Time from 
Noon. 
Nat. Vers d 
Sines. 
Altitude and 
Zenith distance of 
Sun’s Upper and 
Lower Limbs. 
Sun’s Semi- 
diameter. 
Altitudes of Sun’s 
centre. 
h. m. s. 
m. s. 
/ // 
/ // 
O / // 
12 2 48,5 
9 4 6 >2 
908 
68 7 30 L 
+ 16 17,2 
68 23 47,2 
3 5 6 
8 3 8 >7 
712 
9 8,5 L 
+ 
25 25,7 
5 5>5 
7 29,2 
533 
10 27,5 L 
+ 
26 44,7 
East 
> 
7 2 
5 32,7 
293 
12 46 L 
+ 
29 3»2 
8 20,5 
4 14,2 
171 
13 55 L 
+ 
30 12,2 
9 3 8 
2 56,7 
8 3 
14 36 L 
+ 
3 ° 53 > 2 
12 27 
0 7.7 
0 
15 22,5 L 
+ 
3 i 39 >7 
16 2 
3 27,3 
113 
21 46 32,5 L 
— 
29 44>7 
18 55,5 
6 20,8 
3 8 4 
4 8 5 I >5 L 
— 
27 25,7 
20 10 
7 3 S >3 
547 
50 26 L 
— 
25 5 >» 2 
West 
21 52 
9 » 7»3 
820 
52 50 L 
— 
23 27,2 
23 20 
i° 45»3 
1100 
22 20 U 
+ 
21 22,8 
24 48,5 
12 13,8 
1424 
25 22,5 U 
+ 
18 20,3 
- 
26 23 
13 4 8 >3 
1812 
28 44 U 
+ 
14 58,8 
807,18 
0 / a 
Altitude of Q’s centre . 68 24. 12,8c 
O / n 
Refraction . 
. —» O 21, 12 
Latitude o 32 20 Cos. 9,9999808 
Parallax 
+ 0 3>33 
Declination 20 56 4 
1 Cos. 9,9703123 
Correction . 
+ 7 4>55 
Altitude 68 30 59 SecL 10,4362401 
Change of Declination . 
+ 0 0,54 
Log. Sine 1 A.C. 5,3144251 
Log of 807'',! 8 (+ 4) 6,9069704 
O’s true meridian ze- 7 
nithdistance . C ^ ^ 
Log Cor. 
+ 4 2 4 , >SS 
2,6279287 
Declination . 
. . 20 56 4I, OS. 
VUIl^VillV/U “j" f A \ 
Latitude of the Station 
0 32 19,05^ 
Thus we have obtained 86095,56 vibrations of the pen- 
dulum deduced from the stars, and 86095,49 by the sun, in 
twenty-four hours, mean solar time. These results, however, 
as Captain Kater has shown in his paper of 1819, are entitled 
to credit in the ratio of the sum of the factors arising from 
multiplying the number of stars observed by the days in the 
