OF A PENDULUM AT GREENWICH AND LONDON. 
99 
In addition to the preceding, two observations only of the Sun are available, 
which occurring at a time when only one star could be taken, are better em- 
ployed in conjunction with that star; thereby more nearly equalizing the 
share of credit to be attributed to the several results. 
h m s 
July 210 Centre 8 3 50.05 
22 O Centre 8 7 48.82 
h m s 
8 2 55.50 
8 6 54.70 
54.55 1 
54.12 j 
0".43 
Giving this result the same weight as that of (3 Tauri on the 22 nd, where it is 
probable the greatest error exists, we have for the daily rate of the transit 
clock as follows. 
July 21 to 22 . 
—6.45 
m 
or +3 
23. 
— 0.57 
+ 3 
24. 
— 0.56 
+ 3 
25. 
— 0.56 
+3 
26. 
—0.55 
+ 3 
Making use of these rates with the following comparisons, the daily rates 
of the coincidence clock can be obtained up to the 26tli ; and since no obser- 
vations offer to determine the rate on the 27 th, the rate as determined up to 
within twelve hours of the comparison on the 27 th (— 0".55) may with safety 
be used. 
Time by 
Time by Transit 
Interval by 
Interval of 
Interval 
by 
Rate of 
Clock in 
1828. 
Clock. 
Clock. 
Transit Clock. 
Mean Time. 
Clock. 
24 Hours. 
July 21 . 
22 . 
h m s 
7 46 0 
8 24 0 
h m s 
3 41 0.39 
4 23 0.80 
h m s b m s 
24 42 0.41 = 24 3 7 58.08 
h m 
24 38 
// 
+ 1.87 
23. 
7 58 0 
4 0 50.90 
23 37 50.10 = 23 33 58.38 
23 34 
+ 1.65 
24. 
8 40 0 
4 46 51.98 
24 46 1.08 = 24 41 58.21 
24 42 
+ 1.74 
25. 
8 22 0 
4 32 43.50 
23 45 51.52 = 23 41 58.48 
23 42 
+ 1.54 
26. 
8 210 
4 35 37.95 
24 2 54.45 = 23 58 58.61 
23 59 
+ 1.39 
27. 
8 58 0 
5 16 38.38 
24 41 0.43 = 24 36 58.37 
24 37 
+ 1.58 
Thomas Glanville Taylor. 
