Balance or Vertical Force Magnetometer. 
xxxix 
Table 12. — Observations for the Time of Vibration of the Balance Needle in a 
Vertical Plane, November 24 d 0 h , 1843. 
Time of passing the fixed wire. 
Time of 10 Vibrations. 
Cross rising. 
Cross falling. 
Cross rising. 
Cross falling. 
m. s. 
m. s. 
E. 
s. 
6 33-6 
6 44- 1 
54-8 
7 5-4 
7 15-9 
26-7 
8 190 
8 300 
105-4 
105-9 
40-0 
51-3 
105-2 
105-9 
9 10 
9 120 
105-1 
105-3 
Time of one vibration = 10 s- 55. 
Table 13. — Values of T, the Time of Vibration of the Balance Needle in a 
Vertical Plane. 
Gottingen 
Arc at 
commence- 
Number 
of 
Time of 
one 
Tempera- 
ture 
Gottingen 
Arc at 
commence- 
Number 
of 
Time of 
one 
Tempera- 
ture 
Mean Time, 
ment. 
vibrations. 
vibration. 
of Needle. 
Mean Time. 
ment. 
vibrations. 
vibration. 
of Needle. 
d. h. 
Jan. 14 2 
7-5 
30 
9-94 
56-5 
d. h. 
June 15 0 
7-5 
30 
972 
59-5 
Jan. 30 2 
8-0 
20 
9-54 
58-9 
June 20 22 
10-0 
20 
9-80 
58-4 
Feb. 6 3 
15-0 
30 
9-45 
54-5 
June 29 3 
120 
20 
9-50 
55-3 
Feb. 10 0 
80 
10 
9-40 
51-5 
July 13 8 
8-0 
20 
9-25 
67-8 
Feb. 14 0 
120 
28 
9-65 
48-1 
July 21 7 
100 
30 
9-14 
61-7 
Feb. 16 18 
5-0 
10 
10-00* 
"44-0 
July 26 3 
12-0 
30 
9-28 
650 
Feb. 22 1 
12-0 
30 
9-15 
54-4 
July 28 7 
10-0 
20 
9-36 
61-3 
Feb. 27 4 
120 
20 
9-42 
53-0 
Aug. 4 23 
7-5 
30 
9-35 
60-0 
Mar. 10 1 
70 
20 
9-50 
51-2 
Aug. 18 3 
7-5 
30 
9-45 
71-2 
Mar. 13 2 
12-0 
30 
9-30+ 
55-0 
Aug. 22 22 
10-0 
30 
9-25 
54-6 
Mar. 21 3 
12-0 
20 
9-43 
48-5 , 
Mar. 28 3 
100 
12 
9-45 
40-5 
Aug. 25 0 
10-0 
25 
10-75 + 
605 
Apr. 3 3 
10-0 
30 
9-48 
54-0 
Aug. 29 22 
14-0 
30 
9-97 
54-5 
Apr. 11 22 
12-0 
30 
9-65 
35-0 
Apr. 17 3 
7-0 
30 
9-60 
54-5 
Sept. 6 20 
120 
30 
11-25+ 
60-7 
Apr. 23 23 
10-0 
20 
9-78 
46-2 
Sept. 13 1 
120 
30 
10-75 
62-3 
May 1 6 
10-0 
30 
9-80 
57-6 
Sept. 18 2 
120 
30 
10-62 
65-0 
May 9 6 
7-5 
30 
9-73 
54-6 
Sept. 22 3 
8-0 
30 
1062 
63-7 
May 16 18 
7-0 
20 
9-60 
46-2 
May 24 3 
80 
30 
9-70 
49-1 
Sept. 27 6 
7-0 
40 
11-17+ 
51-9 
May 31 23 
100 
30 
9-75 
48-4 
Sept. 29 0 
7-0 
40 
10-95 
46-4 
June 8 2 
10-0 
30 
9-55 
56-2 
Oct. 1 20 
4-0 
- 1 
10 
_______ 
11-04 
56-9 
* Feb. 16. This observation is from a natural vibration (produced by currents of air in the box V). 
t Mar. 13. After this vibration the magnetometer bos was lifted for an instant and then replaced. 
t Aug 23 and 31, and Nov. 12. The balance needle was removed for temperature experiments, 
and on Sept. 26 the magnetometer box was removed in order to be covered with gilt paper. 
