484 CAPTAIN SABINE ON THE LENGTH OF THE SECONDS PENDULUM 
Slider at 1.566. Weight below. 
Exp. F F. September 7th i 
u /beginning 29.422 57.5 
mr °m- /ending . 29.420 CO 
t.M. to September 7th p.m. Dent making 86465.83 vibrations. 
? 29.421 59°; + .019 Capill.j — .079 reduction to 32° = 29.361. 
No. of 
Coincid. 
E 
U 
P 
fcb 
P 
C3 
O 
Times of 
Arc of 
Vibra- 
tion. 
Mean 
Therm. 
Mean 
Interval. 
Mean 
Gauge. 
Correc- 
tion for 
Arc. 
Vibrations 
in 24 hours. 
Disap. 
Reap. 
Coincidence. 
1 
31 
57.0 
58.0 
:::: 
m s 
09 05 
39 54 
m s 
09 13 
40 24 
h m s 
10 09 09 
1 40 09 
L22 
0.21 
] 57.5 
422.00 
— 
O 
+ 0.85 
86056.88 
Exp. G G. September 7th p.m. Dent making 86465.80 vibrations. 
Barom. 29 382 60 } 29,401 6 ° 0) + - 019 Ca P ilL; ~ - 083 reduction to 32° = 29.337. 
1 
31 
58.0 
58.0 
• ■ • . 
m s 
50 37 
21 18 
m s 
50 47 
21 50 
h m s 
1 50 42 
5 21 34 
O 
1.18 
0.20 
1 
O 
j 58.0 
421.73 
.... 
O 
+ 0.79 
86056.53 
Mr. Taylor’s memorandum of the computation of the rate of the Clock by Dent. 
The clock’s rate in these experiments has been deduced from daily compa- 
risons between it and the Greenwich transit clock ; the daily rate of the latter 
being determined from the observations of several stars and of the sun. With 
reference to these observations, it may be necessary to remark that they are 
made by three several observers, as is sufficiently shown in the Greenwich 
observations by the initials of each observer’s name ; and in making use of 
these for determining right ascensions, or the rate of the clock, it becomes 
necessary to apply to each observed transit the constant difference which is 
found to exist between the observer, and the observer of the same star on the 
following day, with which it is compared : for this purpose I have employed 
the difference as pointed out by a great many observations made for the ex- 
press purpose; whence it appears that if the observer T. noted the passage of a 
star at the time r, the observers T. T. and N. would observe it to pass at r + 0 s . 1 6 
and r -j- 0 S .35 respectively. Making use of these, the rate of the Greenwich 
transit clock comes out : 
