276 Captain Hall's details of experiments 
Comparisons of Clock with Chronometer 438 at Rio de Janeiro. 
(' 2 nd Series.) 
Date. 
Chronometer. 
Clock. 
Difference. 
- 
Clock slow. 
h. m. s. 
h. m. 
s. 
h. m. s. 
October 22, 1822 
P. M. 
5 9 42.5 
4 3° 
0 
0 39 42,5 
6 45 44,0 
6 6 
0 
0 39 44,0 
— 
10 1 47,0 
9 22 
0 
0 39 47>° 
2 3 » 
Noon 
10 9 57,0 
9 3 ° 
0 
0 39 57,0 
P.M. 
5 1 2,5 
4 21 
0 
0 40 2,5 
7 5 4-5 
6 25 
O 
0 40 4,5 
8 33 6,0 
7 53 
0 
0 40 6,0 
24, 
Noon 
1 1 21 20 
10 41 
0 
0 40 20,0 
26, 
Noon 
11 4 0,5 
10 23 
0 
0 41 0,5 
28, 
Noon 
10 41 36,9 
10 00 
0 
0 41 36,9 
29, 
Noon 
10 55 55, 5 
10 14 
0 
0 41 55,5 
3 °, 
Noon 
10 31 14,0 
9 49 
0 
0 42 14,0 
3 1 
Noon 
10 25 32,5 
9 43 
0 
0 42 32,5 
November 1, 
Noon 
10 25 51,5 
9 43 
0 
0 42 51,5 
P.M. 
5 4 8 57,5 
5 6 
0 
0 42 57,5 
9 44 1,0 
9 1 
0 
0 43 1,0 
2, 
Noon 
11 6 12,5 
10 23 
0 
0 43 12,5 
P.M. 
4 20 17,0 
3 37 
O 
0 43 17,0 
7 17 20,0 
6 34 
0 
0 43 20,0 
TABLE I. 
Times by Clock at Transits of Stars, 
Stars. 
October 22nd. 
23 rd. 
November 1st. 
2nd. 
h. m. s. 
h. m. s. 
h. in. s. 
h. m, s. 
a Cygni .... 
5 o 24, 0 
4 55 47,04 
4 14 7,71 
— 
1 — 
5 23 25,60 
4 37 9, *4 
— — 
K .... 
5 3 ° ! 9 > ! ° 
5 2 5 4 i, 3 i|+ 44 2 ,54 
— 
e Pegasi 
5 3 8 4 6 > 9 » 
— 
4 5 2 3 o, 7 i 
— 
e Pegasi, 3rd, 4th, and 5th wires 
5 39 * 3 > 8 7 
5 34 35,234 5 2 57 , 4 6 
8 
6 0 18,13 
5 55 40,765 H z >°5 
— 
: t ... 
6 23 31,30 
6 18 52,9915 37 14,59 
— 
u .... 
6 59 S 5 > 3 ° 
6 54 57,95 
— 
/x. — '4th wire 
7 6 31,55 
7 1 54>36 
6 15 37,79 
P 4th and 5 th wires . 
7 1 4 °> 3 6 
— 
6 15 23,79 
0 .... 
7 !5 7,99 
6 28 52, 0 
TABLE II. 
Transits of Sun at Rio de Janeiro. 
Time by Clock 
at mean Noon 
Oct. 23rd. 
24th. 
26th. 
28th. 
29 th. 
30 th. 
3 1 st. 
Nov. 1 st. 
2nd. 
h. m. s. 
10 27 26,78 
h. m. s. 
10 26 44,94 
h. m. s. 
10 25 21,88 
h. m. s. 
10 23 58,88 
h. m. s. 
10 23 16,68 
h. m. s. 
10 22 35,16 
h. m. s. 
10 21 52,67 
h. m. s. 
to 21 10,51 
h. ir.. s. 
10 20 28,61 
