14 
Lieutenant Foster's account of 
No. I. Pendulum Experiments at the Royal Observatory at 
Greenwich , 1824. 
April 1824. 
Comparisons of the Clock with the Observatory Transit Clock. 
Date. 
Time by Clock. 
Time by the 
Observatory Clock 
20th Noon 
h. m. s. 
0 17 00 
h. m. s. 
2 55 i5*45 
P. M. 
3 38 00 
6 16 48,84 
2 1 st A. M. 
7 12 00 
21 53 24,66 
Noon 
11 22 00 
2 4 6,42 
P. M. 
3 50 00 
6 33 51,20 
22d A. M, 
7 56 00 
22 38 00,22 
Noon 
11 42 00 
2 28 9,48 
P. M. 
3 30 00 
6 16 47,16 
23d A. M. 
8 5 00 
22 54 32,95 
Noon 
11 22 00 
2 12 5,85 
P. M. 
3 32 00 
6 22 47,40 
24th A. M. 
7 38 00 
22 31 27,81 
Noon 
11 21 00 
2 15 5,0 
P. M. 
3 37 00 
6 31 47*4i 
25 th A. M. 
8 17 00 
2 3 H 33-70 
Noon 
11 18 00 
2 16 4,20 
Mean Time 
at Greenwich 
h. m. s. 
I 8 3,07 
4 22 3,47 
7 5 6 5 *9 6 
o 6 6,72 
4 34 7>38 
8 40 9,60 
o 26 10,08 
4 H IO >35 
8 49 12,75 
o 6 13,25 
4 16 13*73 
8 22 15,56 
o 5 16,20 
4 21 16,57 
9 1 18,64 
o 2 19,40 
Clock slow 
of Mean Time. 
h. m. s. 
0 44 3*07 
0 44 3*47 
o 44 5*9 6 
o 44 6,72 
o 44 7*38 
o 44 9,60 
o 44 10,08 
o 44 10,35 
o 44 12,75 
° 44 *3*25 
o 44 1 3*73 
o 44 15,56 
o 44 16,20 
o 44 16,57 
o 44 18,64 
o 44 19,40 
From the preceding Table of Comparisons, this, of Rates losing has been deduced. 
Time of 
Comparison. 
From 
20 to 21 
From 
20 to 22 
From 
20 to 23 
From 
20 to 24 
From 
20 to 25 
From 
21 to 22 
From 
21 to 23 
From 
21 to 24 
From 
21 to 25 
From 
22 to 23 
From 
22 to 24 
From 
22 to 25 
From 
23 to 24 
r 1 
From 
23 to 25 
h. 
8 A. M. 
8. 
s. 
s 
s. 
s 
s. 
3.53 
s. 
3*18 
s. 
s. 
s. 
s. 
s. 
2,87 
9. 
3*33 
3**3 
3*13 
3.00 
3.00 
2*93 
Noon 
3*79 
3*55 
3*44 
3*3 1 
3,29 
3*3 » 
3,26 
3*l6 
3**7 
3.21 
3*o8 
3*12 
2 *95 
b 
00 
4 P. M. 
3*88 
3*45 
3*4 2 
3*2 7 
3>oi 
3**9 
3*07 
3*38 
3>io 
2,83 
Rate in a 1 
mean so- > 
lar day. J 
3*83 
3*5° 
3*43 
3* 2 9 
3*29 
3,28 
3-26 
3*»4 
3*i5 
3*24 
3*06 
3*06 
2,88 
3.00 
