PENDULUM AT THE ROYAL OBSERVATORY, CAPE OF GOOD HOPE. 165 
Observations computed. The clock making on the 16th, 86636.057, and on 
the 17th, 86636.027 sidereal vibrations in a mean solar day. 
Number of 
Observations. 
Mean Temp. 
Interval. 
Vib ns in 24 Mean 
Solar Hours. 
Corr. for 
Arc. 
Reduc. to 
62° Fahk. 
Reduced Vib ns in 
24 Mean Solar 
Hours at 62° F. 
1 
76.95 
h m s 
1 44 34.0 
86083.707 
+ 1.890 
+ 6.294 
86091.891 
2 
73.62 
1 44 46.0 
86084.762 
1.607 
4.892 
86091.261 
3 
72.85 
1 44 56.5 
86085.681 
1.146 
4.568 
86091.395 
4 
71-45 
1 45 1.5 
86086.088 
1.890 
3.978 
86091-956 
5 
71.85 
1 45 0.75 
86086.022 
1.867 
4.147 
86092.036 
6 
72-60 
1 45 2.5 
86086.175 
1.370 
4.463 
86092.008 
7 
73.20 
1 44 58.5 
86085.826 
1.501 
4.715 
86092.042 
8 
73.62 
1 44 52.5 
86085.301 
1.700 
4.892 
86091.893 
9 
73.92 
1 44 54.5 
86085.476 
1.589 
5.018 
86092.083 
10 
73.75 
1 44 51.5 
86085.214 
+ 1.879 
+ 4.947 
86092.040 
Mean . . 
73.38 
Mean. . . . 
Correction for buoyancy 
86091.860 
+ 5.876 
Number of Vibrations in vacuo, in 24< Mean Solar Hours 
86097-736 
Rate of the Sidereal Clock. 
Jan. 16th. 
Stars. 
12 Eridani. 
17 . 
£ Orionis . 
p Aurigae . 
S Geminor. 
/3 Can. Min 
Castor . . . 
Procyon. . . 
Mean. 
Rates. 
-oW 
.40 
.52 
.33 
•70 
.28 
.38 
.56 
- .65 
- .499 
c3 
> 
53 jz 
c n *- 
-Q 
O ^ 
_ CD 
r3 
CD 
c3 
CL, 
£ 
o 
U 
Jan. 17th. 
Stars. 
Rates. 
a Persei . . 
— 0^60 1 
17 Eridani. . 
.50 
19 •• 
.50 
CO 
a 
S 
.42 
o 
y Orionis . . 
.65 
a • 
S 
.59 
Ui 
CD 
£ * . . 
.58 
lO r— t 
-O 
i •• 
.74 
o-g 
j«, Columbse 
.60 
!> 
^ jr 
j3 Aurigae . . 
.33 
£ iO 
0 Leporis . . 
.50 
-T3 
s Can. Maj. 
.50 
£ ■£ 
S 
.48 
Q*, 
$ Geminor. 
.57 
§ ° 
/3 Can. Min. 
.38 
CJ 
Procyon. . . . 
.47 
Pollux .... 
- -58 J 
Mean . . 
- .529 
Abstract of Captain Ronald’s observations. 
London. Mean of 1 10 coincidences . = 86164.62 
Cape. . Mean of 270 coincidences . . . = 86097.61 
. 160 = 86097.88 
. 200 = 86097.74 
True Mean of 630 coincidences at the Cape = 86097-73 
