the Density of the Earth . _ 489 
Weights moved to positive position. 
Extreme 1 
points. 
Divisions. 
Time. 
Point of 
rest. 
... - 
Time of mid. 
of vibration. 
Difference. 
h- , , 
h. , - 
t A 
20,2 
24 
2 6 
11 49 ) 
5 ° 1 9 1 
- 
11 49 37 
29>4 
- - 
2^95 
- - 
7 7 
2 6 
25 
56 15 ) 
47 J 
- 
56 44 
20,8 
- 
- - 
24^92 
28,7 
- 
- 
24,87 
21,3 
- 
- - 
24,85 
28,1 
- 
- 
24,75 
21,5 
- 
- 
24,67 
2 7,6 
- 
- 
24,67 
22 
- 
- - 
24,7 
24 
0 45 4 8 \ 
0 46 21 
2 5 
4 ^ 43 J 
27,2 
- 
■ - - 
2 4>7 
— — 
7 1 
25 
53 11 ) 
a 
53 22 
24 
54 9 J 
22,4 
Motion of arm on moving weights from 
pos. to neg. = 5,9 
neg. to pos. - = 5,98 
Time of one vibration, when weights are in 
neg. position - - =7' 5" 
pos. position - - =75 
In the fourth experiment, the effect of the weights seemed to 
increase on standing, in all three motions of the weights, con- 
formably to what was observed with the former wire ; but, in 
MDCCXCVIII. g R 
