OF A PENDULUM AT GREENWICH AND LONDON. 
91 
r oq 40 1 
Exp. 7. March 20th. Clock making S6400.07 Vibrations. Barom. -j ~ g ‘ 3 ~ 7 29.375 
Therm. 
0*3 
6 .S 
Times of 
Arc and 
Correction. 
Mean 
Interval. 
Reduct, 
to 62°. 
Corrected Vibra- 
tions in a Mean 
Solar Day. 
Disapp. 
Re-app. 
Coincidence. 
60.7 
60.9 
61.5 
61.5 
1 
2 
3 
27 
28 
29 
m s 
39 59 
46 34 
53 07 
31 17 
37 52 
44 28 
m s 
40 02 
46 36 
53 11 
31 24 
37 59 
44 35 
h m s 
9 40 00.5") h m s 
9 46 35.0 > 9 46 34.83 
9 53 09-0 J 
12 31 20.5T 
12 37 55.5 >12 37 55.83 
12 44 31.5 J 
f.ll*) s 
> + 0.87 
0.40 J 
s 
395.42 
— 0.36 
85963.55 
ExP. 8. Fresh impulse given. Barom. ^09 01 1 29.27 
Therm. 
-d 
0 0 
Times of 
Arc and 
Correction. 
Mean . 
Interval. 
Reduct, 
to 62°. 
Corrected Vibra- 
tions in a Mean 
Solar Day. 
Disapp. 
Re-app. 
Coincidence. 
O 
61.5 
61.5 
61.1 
61.2 
1 
2 
3 
34 
35 
36 
m s 
50 55 
57 29 
04 01 
28 19 
34 54 
41 30 
m s 
50 56 
57 30 
04 04 
28 27 
35 05 
41 41 
h m s 
12 50 55.5*1 h m s 
12 57 29.5 >12 57 29.12 
1 04 02.5 J 
4 28 23.0*] 
4 34 59.5 > 4 34 59.33 
4 41 35.5 J 
f - 12 ] . 
> + 0.75 
0.32 J 
s 
395.46 
s 
-0.28 
85963.55 
Table B. 
Determination of the rate of the clock by Graham at the Royal Observatory 
Greenwich, from the 15 th to the 20th of May inclusive, and from the 
4th to the 6th of June inclusive : by Mr. Taylor. 
“ The comparison of the clock with the Greenwich transit clock was effected 
by means of a machine constructed by Hardy for the purpose, it being capable 
of indicating 0".05 in time ; and from the mean of 5 comparisons which was 
always employed, it is hoped the comparisons never err 0.03 from the truth ; 
these comparisons were made at or near the time the observations were making 
for the rate of the transit clock, on the accurate determination of which must 
rest the accuracy of the rate of the clock used in the experiment. 
