IN THE OBSERVATORY OF GREENWICH. 
485 
1829. 
August 21 to 24 
25 
26 
27 
28 
29 
30 
31 
S S 
— 0.36 
September 1 
-0.24 
— 0.22 
3 
— 0.32 
-0.18 
4 
-0.20 
— 0.42 
6 
— 0.38 
— 0.25 
7 
-0.31 
-0.34 
8 
-0.11 
~l ox 
d o 
1 1 
Mean . 
-0.266 
From the near accordance of these results with one another, and from a con- 
sideration of the inability of two or three observations (which could only be 
taken in some cases, on account of the cloudy weather) to determine very cor- 
rectly the rate, I have preferred taking the general mean 0 S .27 rather than 
each individual result. This was accordingly employed with the following 
comparisons. 
Comparison of the Clock Dent with the Greenwich Transit Clock. 
1829. 
d 
Dent. 
h 
m 
August 
20 
21 
52 
24 
5 
24 
24 
22 
9 
25 
22 
37 
26 
23 
16 
27 
23 
40 
28 
23 
11 
29 
22 
28 
■ 30 
23 
6 
Sept. 
1 
0 
3 
• 2 
0 
8 
3 
23 
28 
6 0 0 
Transit Clock. Daily rate of Dent. 
h m s 
7 51 
15 33 
8 20 
8 51 
9 33 
9 59 
9 33 
8 53 
9 34 
10 34 
10 42 
10 7 
10 45 
50.44 
13.45 
11.95 
5.40 
0.20 
52.88 
39.00 
23.90 
18.20 
14.80 
5.30 
40.33 
24.00 
m s 
} + l 5.92 . 
} 1 6.66 . 
} 1 6.01 . 
} 1 5.96 . 
} 1 6.32 . 
} 1 6.60 . 
} 1 6.18 . 
} 1 6.34 . 
} 1 6.28 . 
} 1 6.19 . 
} 1 6.28 . 
} 1 6.19 . 
Rates employed. 
m s 
+ 1 5.92 Aug. 23 
1 6.29 — 24 
1 6.33 — 25 
1 5.98 — 26 
1 6.14 — 27 
1 6.46 — 28 
1 6.39 — 29 
1 6.26 — 30 
1 6.31 — 31 
1 6.24 Sept. 1 
l 6.23 — 2 & 3 
1 6.23 — 4 & 5 
Clock was stopped for the re-adjustment of the disc. 
7 2 41 . . 13 30 44.20 \ n 1 6.14 — 7 
8 2 59 . . 13 51 36.40/ * ' 1 6.14 — 8 
The column entitled c Rates employed’ will be found to be the mean between 
the two daily rates in the preceding column ; these are those which the 
clock may be supposed to have attained at midnight, the middle time between 
the two comparisons ; but since the comparisons were taken in the middle of 
