250 



Magnetic Influence of Solar Light, 



TABLE II. 



Shewing the Duration of Oscillations of Needle A. after exposure. 





Hour of 



cm 



O 



day. 



o . 



is- 









M 



A. M. 



P. M. 





Jan. 







In. 



10th 





1 



4 









... 



© 03 



Q 



In. 



0-05 



O p3 



O «o 



85° 



Sums, 

 Means, 



50 



Sea. 

 99 

 100 

 100 

 101 

 101 

 99 

 98 

 99 

 100 

 100 



997 



o 2 



o > 



209 



1 19-94 



Remarks. 



TABLE III. 



Shewing the Duration of Oscillations of Needle B. before exposure.- 



No. of Exp. 



Date of 

 Exp. 



Hou 

 d. 



A. M. 



r of 



P. M. 



Length of 

 Needle. 



| Diam. of 

 | Needle. 



Temp. 



I No. of 

 I Oscill. 



Duration 

 of Oscill. 



No. of 

 Traverses. 



Remarks. 





Jan. 







In. 



In. 







Sea. 





An error in count- 



1 



12th 



11 





4 



0-05 



G5° 



20 



314 



0 



ing one vibration too 



2 















20 



300 





many has evidently 



3 















20 



300 





been made here. The 



4 















20 



300 





Observation is there- 



5 















20 



302 





fore rejected. An er- 



(5 















20 



300 





ror of this kind is 



7 















20 



301 





very easily made. 



8 















20 



300 







9 















20 



299 







1 0 















20 



300 







Sums, ... 

 Means, ...J 



200 

 1 



301G 

 15011 









