IN THE OBSERVATORY OF GREENWICH. 
483 
ExP. A A. September 1st p.m. to September 2nd p.m. Dent mating 86466.24 vibrations. 
No. of 
Coincid. 
S 
O 
tJD 
3 
a 
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 
132 
57.0 
56.1 
in. 
0.665 
1.140 
m s 
23 35 
9 58 
m s 
23 44 
10 25 
h m s 
9 23 39.5 
25 10 11.5 
o 
1.40 
0.30 
O 
f 56.55 
j + 0.75 
433.53 
0.90 
+ E23 
86068.56 
l 57-30 
ExP. 13 B. September 2nd p.m. Dent making 86466.24 vibrations. 
1 
76 
57-0 
56.7 
in. 
0.72 
1.07 
m s 
15 52 
16 54 
m s 
16 01 
17 18 
h m s 
1 15 56.5 
10 17 06 
1°30 
0.55 
f 56°.85 
j + 0.75 
432.93 
0.895 
+ 1?63 
86068.41 
L 57.60 
ExP. C C. September 2nd p.m. to September 3rd a.m. Dent making 86466.24 vibrations. 
1 
80 
56.7 
55.4 
in. 
0.70 
1.14 
m s m s 
25 49 26 02 
56 3356 55 
h m s 
10 25 55.5 
19 56 44 
1.20 
0.48 
f 56.05 
J + 0.75 
433.53 
0.92 
+ 1?33 
86068.67 
l 56.80 
ExP. D X). September 3rd a.m. to September 3rd p.m. Dent making 86466.23 vibrations. 
1 
79 
O 
55.5 
56.0 
in. 
0.80 
1.34 
m s 
06 37 
30 17 
m s 
06 46 
30 44 
h m s 
20 06 41.5 
5 30 30.5 
0 
1.30 
0.48 
r 55°.75 
^ + 0.75 
433.70 
1.07 
+ 1°47 
86068.97 
(_ 56.50 
ExP. E E. September 3rd p.m. to September 4th a.m. Dent making 86466.23 vibrations. 
1 
147 
56.0 
55.5 
in. 
0.89 
1.17 
m s 
40 31 
16 42 
m s 
40 40 
17 17 
h m s 
5 40 35.5 
23 16 59-5 
1.30 
0.19 
f 55°75 
J + 0.75 
434.14 
1.03 
+ 0 ?99 
86068.89 
i 56.50 
The air was then admitted, and the following observations made to obtain 
the reduction to a vacuum, for the small portion of air remaining in the appa- 
ratus, indicated by the gauge, in those of the preceding experiments in which 
the weight was below. 
