Damping of Galvanometer Needles. 



569 



Fig. 4 





_,___. __£. _j_ __ _ __ . 





^ • X it 





o_I± X - 





1 ! 





ff<3 11 J 





*° ■ k , y - „. _.. 







---- — *:—--*-- *--- 



r ^ 3 



fc ■ •!■ t 



i 1 (Lrtf^/^z,:? 







j. 





tl 





i 1 





























1 









1' ! 

























_L — LU 1 J,_.. t ^ 1 1 , , , , _ 



-i — ; -XL^ „__„„___ — ^ 



11 Hi — L — j^-a-t-^--^--*--^-}: 





■ +'' ■ n ,p 



- ■""■• -C X^ 1 



j J j i ! >^ h'M//,/an 







1 1 ~h H A 





i^t i / * 





DJ 1 / 





• „/ 





it 

















\ j i 









, ' ! 





6o i ' 1 i , i 1 i 1 





Period, t, in seconds. 



Table IV. 



/2 s* J 5 



Galvanometer Circuit open, 



Experi- 

 ment 



/(cor- 1 

 rected) J 



Observed 

 Period = t. 



2-66 



365 



5-52 



764 

 11 18 

 1670 



Undamped | Decrement 

 Period =T,I -=d. 



2-G6 

 3-05 

 5-52 

 7-635 

 11 17 

 1666 



1034 

 1-047 

 1072 

 1101 

 1-150 

 1-233 



Logg d — X. 



00344 



00459 



00695 



00962 



0140 



0-209 



Rati t/\. 



79-6 

 79-5 

 79-4 

 79-4 

 79-6 

 79-4 



Galvanometer Circuit closed. 



/ (cor- 1 

 rected) J 



266 



3-65 



570 



7-78 



11-27 



16-30 



2-66 

 365 

 5-70 

 7-775 

 11-26 

 1626 



1-0425 



1-057 



1-087 



1-121 



1-180 



1-269 



0417 



0-0560 



00834 



0114 



0-165 



0-238 



63 8 

 65-3 



68 3 

 68-1 

 68-3 

 68-5 



Phil Mag. g. 5. Vol. 49. No. 301. June 1900. 



2 R 



