BALANCE OR VERTICAL ForcE MAGNETOMETER. XXX1X 
TABLE 12.—Observations for the Time of Vibration of the Balance Needle in a 
Vertical Plane, November 244 0*, 1843. 
Time of passing the fixed wire. Time of 10 Vibrations. 
Cross rising. Cross falling. Cross rising. | Cross falling. 
Time of one vibration = 10::55. 
TABLE 13.—Values of T, the Time of Vibration of the Balance Needle in a 
Vertical Plane. 
re Arcat | Number | Time of | Tempere- ees Are at | Number | Time of | Tempera- 
Gottingen commence- of one ture Gottingen commence- of one ture 
Mean Time. ment. | vibrations.| vibration. | of Needle, Mean Time. ment. | vibrations.| vibration. | of Needle. 
a h. 8. o dij) “he a Ss. 2 
| Jan. 14 2 75 30 9-94 56:5 Junel5 0 75 30 9-72 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 12-0 20 9-50 55-3 
Feb. 10 0 8-0 10 9-40 51-5 July 13 8 8-0 20 9-25 67-8 
| Feb. 14 0 12:0 28 9-65 48-1 July 21 7 10-0 30 9-14 61-7 
| Feb. 16 18 5:0 10 10-00* 44.0 July 26 3 12-0 30 9-28 65-0 
‘| Feb. 22 1 12-0 30 9-15 54-4 July 28 7 10-0 20 9-36 61-3 
| Feb. 27 «4 12-0 20 9-42 53-0 Aug. 4 23 75 30 9-35 60-0 
| Mar. 10 1 7-0 20 9-50 51-2 Aug. 18 3 75 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 9.43 550) il a rT at | 
| Mar. 28 3 10-0 12 9.45 40:5 Aug. 25 0 10-0 25 10-75t 60-5 
3 3 10-0 30 9-48 54.0 Aug. 29 22 14.0 30 9-97 54:5 
11 22 12-0 30 9-65 2B) |) $e | 
i? 3 7-0 30 9-60 54-5 Sept. 6 20 12-0 30 11-25+ 60-7 
. 23 23 10-0 20 9-78 46-2 Sept.13 1 12-0 30 10-75 62-3 
1 6 10-0 30 9-80 57-6 Sept.18 2 12-0 30 10-62 65-0 
9 6 7-5 30 9-73 54:6 Sept. 22 3 8-0 30 10-62 63-7 
16 18 7-0 20 9-60 46-2 = =| => oie ene a 
24 3 8-0 30 9-70 49-1 Sept. 27 6 7:0 40 11-17 51-9 
4 31 23 10-0 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 10 11-04 56-9 
* Feb. 16. This observation is from a natural vibration (produced by currents of air in the box ?). 
+ Mar. 13. After this vibration the magnetometer box was lifted for an instant and then replaced. 
{ Aug 28 and 31, and Noy. 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. 
