PENDULUM AT THE ROYAL OBSERVATORY, CAPE OF GOOD HOPE. 173 
Third Series computed. 
1829. 
Mean 
Temp. 
Interval. 
Uncorrected No. 
of Vibrations. 
Clock’s 
Rate. 
Correc. for 
Arc. 
Reduc. to 
62° Fahr. 
Reduced Vib ns 
in 24 Mean Solar 
Hours. 
7L100 
h m s 
2 21 46 
86086.56 
-0.01 
+ 1.361 
+ 3.831 
86091.74 
67.300 
5 21 2 
86087-82 
+ 0.14 
1.587 
2.231 
86091.78 
73.400 
1 59 39 
86085.38 
+ 0.14 
1.567 
4.799 
86091.89 
75.825 
2 37 17 
86085.72 
+ 0.14 
0.675 
5.820 
86092.35 
74.350 
2 47 37 
86085.22 
+ 0.14 
1.336 
5.199 
86091.89 
73.325 
5 3 12 
86085.12 
+ 0.14 
1.640 
4.768 
86091.67 
74.150 
5 35 20 
86085.36 
— 0.02 
1.167 
5.115 
86091.62 
80.825 
1 44 27 
86083.60 
— 0.02 
0.974 
7.925 
86092.45 
81.250 
2 41 40 
86082.82 
-0.02 
1.098 
8.104 
86092.00 
79-675 
2 5 11 
86082.88 
— 0.02 
1.241 
7.441 
86091.54 
76.975 
5 34 40 
86084.30 
— 0.02 
1.428 
6.304 
86092.01 
80.375 
2 20 50 
86082.92 
— 0.02 
1.348 
7-736 
86091-98 
80.600 
2 26 0 
86082.72 
-0.02 
1.464 
7-831 
86091.99 
79-175 
1 33 53 
86082.86 
-0.02 
+ 1.302 
+ 7.231 
86091.37 
Mean. . 
76.301 
Buoyancy 
Mean .... 
86091.85 
+ 5.85 
(No. of Coincidences = 
_ Number of Vibrations in vacuo, 1 
— J k ) j n 04 , Mean Solar Hours . . J " 
86097-70 
Rate of the Sidereal Clock. 
Dec 23rd. 
Dec. 24th. 
Dec. 25th, 26th, & 27th. 
By a Ceti 
Aldebaran .... 
Rigel 
/3 Tauri 
S Orionis 
i •••• • 
Mean Rate . . 
s 
-0.02 
-0.01 
-0.05 
— 0.01 
+ 0.01 
-0.08 
By a Ceti • 
Aldebaran .... 
Rigel 
/3 Tauri 
$ Orionis 
i 
Mean Rate. . 
s 
+ 0.02 | 
0.26 
0.17 j 
0.02 1 
0.00 
+ 0.35 
By Rigel 
/S Tauri 
0 Orionis 
? 
Mean Rate. . 
+ 0.09 
+ 0.01 
-0.10 
-0.08 
-0.02 
-0.01 
+ 0.14 
Fourth Series. 
1830. 
Attached 
Therm. 
Barom. 
Therm. 
No. of 
Disapp. 
Re 
-app. 
Time of Coin, 
by the Siderea 
Clock. 
Arc. 
Remarks. 
A. 
B. 
Coin. 
inches. 
m 
S 
m 
s 
h 
m 
S 
Jan. 22 j 
67-5 
30.088 
67.8 
68.2 
1 
16 
11 
16 
29 
16 
16 
20 
1.40 
Shut 
the clock door, 
68.0 
30.085 
67.2 
67.4 
11 
8 
47 
9 
5 
17 
8 
56 
1.03 
and 
kept the North- 
68.0 
30.085 
67.8 
68.1 
1 
14 
4 
14 
20 
17 
14 
12 
1.01 
chase open. 
69.0 
30.085 
68.2 
68.6 
11 
6 
47 
7 
3 
18 
6 
55 
0.76 
J 
69.0 
30.085 
69.2 
69.7 
1 
12 
4 
12 
20 
18 
12 
12 
0.72 
”1 
70.0 
30.087 
69.8 
70.2 
11 
4 
48 
5 
4 
19 
4 
56 
0.52 
J 
72.0 
30.087 
72.0 
72.3 
1 
18 
301 
18 
361 
19 
18 
331 
1.91 
” l 
72.0 
30.084 
71.5 
71-7 
11 
10 
47 
11 
2 
20 
10 
544 
1.36 
/ 
72.0 
30.084 
72.6 
73.2 
1 
16 
1 
16 
17 
20 
16 
9 
1.34 
Closed the clock door, 
”1 
72.0 
30.062 
71.2 
71.5 
11 
8 
31 
8 
47 
21 
8 
39 
0.97 
the 
Northern chase 
/ 
72.0 
30.062 
71.7 
71-9 
1 
13 
45± 
14 
2f 
21 
13 
54 
0.93 
still 
open. 
”1 
72.0 
30.055 
70.5 
70.8 
11 
6 
20 
6 
36 
22 
6 
28 
0.71 
f 
72.5 
30.037 
71.2 
71.5 
1 
10 
21 
10 
37 
23 
10 
29 
1.47 
”1 
72.5 
30.035 
70.2 
70.4 
12 
8 
H 
8 
181 
0 
8 
10 
1.06 
/ 
72.5 
30.035 
71.2 
71.5 
1 
13 
17 
13 
33 
0 
13 
25 
1.02 
”t 
72.5 
30.043 
70.0 
70.3 
11 
5 
511 
6 
81 
1 
6 
0 
0.78 
Mean. . 
70.844 
30.063 
