234 
Captain Hall’s details of experiments 
TABLE I. 
Time by the Clock of Transits of Stars at the Galapagos. 
Stars. 
1822. 
1 2 Eridani 
£ Eridani 
e Eridani 
£ Eridani 
a. Reticuli 
(3 Eridani 
Rigel 
y Orionis 
j Orionis 
t Orionis 
£ Orionis 
Do. (5th wire) 
Orionis 
January 9 . 
h. m. s. 
7 57 29,28 
8 17 29,57 
8 27 37,50 
9 5 8 35 , 5 ° 
io 8 5,80 
10 15 27,85 
10 19 43,37 
10 24 17,68 
25 8,03 
IO 31 47,70 
January lo. 
h. m. s. 
7 55 16,10 
8 12 33,60 
8 22 42,45 
9 46 49,10 
9 53 39 > 9 8 
10 3 11,25 
IO IO 33,50 
IO 14 48,30 
10 19 23,05 
20 13,80 
January 13. 
h. m. s. 
8 45 12,88 
9 3 2 5 > 9 2 
9 3 8 57-37 
9 48 28,87 
9 55 5°-5 3 
10 00 5,37 
10 
4 40,40 
5 3 l >°° 
January 14. 
h. 
m. 
s. 
h. m. s. 
7 
32 
55 , 5 ° 
7 
35 
3 6 ,95 
7 47 5 8 ,63 
7 
52 
55,00 
8 
3 
3,5 8 
7 5 8 7 ,° 2 
8 40 16,80 
2 7 9 > 5 ° 
34 !> 02 
43 3 1 >S 7 
5 ° 53-75 
55 g A8 
9 59 43,20 
o 34,20 
10 7 13,08 
January 15 . 
(5th Wire) 
9 55 37,50 
TABLE II. 
Transits of the Sun. 
Time by Clock at the moment of mean Noon. 
January 9 . 
January 10 . 
January 11. 
January 12 . 
January 13. 
January 14, 
January 15 
h. m. s. 
12 9 23,82 
m. s. 
8 2 3> 2 7 
m. s. 
7 2 3, 2 7 
m. s. 
6 26,90 
m. s. 
5 28,67 
m. s. 
4 28,65 
m. s. 
3 27,27 
From these two Tables (which are formed from the last column of the Transit 
Table, pages 226 ^nd 227,) the following Rates have been computed, by com- 
paring the transits of each night with those of each of the other nights, when 
the same stars were observed, dividing the difference by the number of days in the 
interval, and subtracting from the quotient 3“ 55 s ,9i, the acceleration jin one day ; 
to this rate o s ,i6 have been added for the additional loss of the clock in four mi- 
nutes, to obtain the rate in a mean solar day. 
The sun was fortunately observed every day throughout the whole of these 
operations ; so that by comparing the time by clock at the moment of mean noon of 
each day, with that on each succeeding day, the rate for 21 separate intervals is 
obtained. 
