488 CAPTAIN SABINE ON THE LENGTH OF THE SECONDS PENDULUM. 
Exp. R R. Fresh impulse. Barom. 1 29*500 } ^9.486 a t53°.5 ; +.019 Capill. ; — .035 to 32°=29.440. 
No. of ; 
Coincid. ! 
Therm. 
Times of 
Arcs of Vibration. 
Mean 
Temp. 
Mean 
Interval. 
Correc- 
tion for 
Arc. 
Reduc” 
to mean 
temp.53° 
Reduc- 
tion to a 
Vacuum. 
Vibrations 
in Vacuums 
at 53°. 
Disap. 
Reap. 
Coincidence. 
1 
43 
54.4 
53.0 
m s 
50 07 
11 39 
m s 
50 17 
12 04 
h m s 
2 50 12 
7 11 51.5 
0.80X1.05 = 0.84 
0.12X1.05 = 0.13 
j 53.7 
373.80 
+ 0.35 
+ 0.30 
+ 11.97 
86070.64 
Mr. Taylor’s memorandum of the computation of the rate of the Clock by Graham. 
The rate of the clock by Graham has been determined by comparisons be- 
tween it and the Greenwich transit clock, made at intervals of twelve hours 
nearly ; the rate of the latter being determined by transits of the sun and of 
several stars, from which it appears that the transit clock’s rate was, 
s 
1829. September 29 evening to September 30 evening -f 0.06 
30 to October 1 —0.14 
October 1 to 2 — —0.04 
These being employed with the following comparisons give the rate of the 
clock Graham : 
Graham. 
h m 
September 30 morning 18 33 
30 evening 6 23 
October 1 morning 19 20 
1 evening 6 33 
2 morning 18 58 
Transit Clock. Rate of Graham. 
h m s 
11 35 27.05 
23 26 14.10 
12 24 26.48 
23 38 20.45 
12 4 20.30 
m s 
H-2 0.76 
} 2 0.63 
} 2 0.79 
} 2 0.67 
The very near accordance of these results with their mean +2 m 0 S .7E will 
seem to justify the use of this quantity for the experiments of September 30 
and October 1. 
Daily rate of clock Graham, October 3 to 6. 
m s 
1829. October 3 noon to 4 noon +2 0.80 
4 to 5 2 0.89 
5 to 6 0.93 
(Signed) Thomas Glanville Taylor. 
