length of the pendulum vibrating seconds . 65 
In repairing the knife edges after the termination of the 
first series of experiments, one of them was broken, and 
when it was replaced by another, the distance between them 
was increased about one hundredth of an inch, a circum- 
stance which proved rather gratifying than otherwise, as it 
afforded a pendulum differing in length from the former one, 
and which yet gave nearly the same result. 
June 9th, 1817, the knife edges being adjusted parallel to 
each other, and the scale and pendulum having remained 
together for several preceding days, the pieces A, a, and B, b, 
were applied to the knife edges in the manner described in 
the former part of this paper, and the following measure- 
ments were taken. 
Distance from A to a, < 
529,06 divisions. 
B to b, 366,97 
ID cite* 
Readings of the micrometer. 
Division? 
A to a. 
B to b. 
Scale. 
+ 39>4 5n - 
June 
27,0 
62,0 
653,0 
956,51 
9th. 
21,0 
52,0 
642,7 
954> 21 
*3>° 
52,0 
642,5 
958>oi 
12,0 
48,0 
638,5 
956,5 1 
18,0 
5°>° 
643,0 
957>° 1 
18,0 
5 0,0 
642,0 
956,0 1 
The pieces changed. 
10th. 
65,5 
1 12,7 
698,0 
956,91 
64,0 
112,5 
696,0 
955,76 
6*1,0 
106,2 
693,2 
957,6i 
6^5 
108,0 
693,5 
955, 26 
65,0 
106,2 
69k£ 
956,91 
67,2 
107,0 
696,0 
956,91 
Mean of the 
whole 
956, 47 
MDCCCXVIII. 
K 
