Balance oe Vertical Foece Magnetometee. 



xxxix 



Table 12. — Observations for the Time of Vibration of the Balance Needle in a 

 Vertical Plane, November 24<i 0^ 1843, 



Time of passing the fixed wire. 



Time of 10 Vibrations. 



Cross rising. 



Cross falling. 



Cross rising. 



Cross falling. 



m. s. 



6 33-6 

 54-8 



7 15-9 



8 190 

 40-0 



9 1-0 



m. s. 



6 44-1 



7 5-4 

 26-7 



8 300 

 51-3 



9 12-0 



s. 



105-4 

 105-2 

 105-1 



s. 



105-9 

 105-9 

 105-3 



Time of one vibration = 10='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. 

 June 15 



h. 







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 



12-0 



20 



9-50 



55-3 



Feb. 10 



8-0 



10 



9-40 



51-5 



July 13 



8 



8-0 



20 



9-25 



67-8 



Feb. 14 



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 



120 



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 



7-5 



30 



9-35 



60-0 



Mar. 10 1 



7-0 



20 



9-50 



51-2 



Aug, 18 



3 



7-5 



30 



9-45 



71-2 



Mar. 13 2 

 Mar. 21 3 

 Mar. 28 3 



120 

 12-0 

 100 



30 

 20 

 12 



9-30t 



9-43 



9-45 



55-0 



48-5 

 40-5 



Aug. 22 



22 



10-0 



30 



9-25 



54-6 



Aug. 25 







10-0 



25 



10-75 + 



60-5 



Apr. 3 3 

 Apr. 11 22 



10-0 

 12-0 



30 

 30 



9-48 

 9-65 



54-0 

 35-0 



Aug. 29 



22 



14-0 



30 



9-97 



54-5 















Apr. 17 3 



7-0 



30 



9-60 



54-5 



Sept. 6 



20 



12-0 



30 



11-25+ 



60-7 



Apr. 23 23 



10-0 



20 



9-78 



46-2 



Sept. 13 



1 



12-0 



30 



10-75 



62-3 



May 1 6 



100 



30 



9-80 



57-6 



Sept. 18 



2 



12-0 



30 



10-62 



65-0 



May 9 6 

 May 16 18 



7-5 



7-0 



30 

 20 



9-73 

 9-60 



54-6 

 46-2 



Sept. 22 



3 



8-0 



30 



10-62 



63-7 









I 







May 24 3 



8-0 



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 







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 ■?). 

 t Mar, 13, After this vibration the magnetometer box vs^as lifted for an instant and then replaced. 

 X 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 papei% 



