Magnetic Influence of Solar Light. 253 

 TABLE VIII. 



Shewing the Duration of Oscillations of Needle C. after farther exposure. 



Exp. 



Exp. 



Hour of day. 



4-1 

 o 



o . 





'scill. 



o 



H j; 





cm 

 o 



=w 



o 









a 1 ? 



I 



O 



.2 -3 



, v 



=m cn 

 O u 



Remarks. 



o" 



a> 



A. M. 



P. M 



§ <U 



>Ato 



.3 m 

 fife 



H 



o 



26 



3 



6* 





to 



ft 













1 



Q 



to 







Jan. 







In. 



In. 







Sea. 







1 



19th 





2 



5 



0-04 



81° 



20 



624 



600 





2 















20 



625 







3 















20 



624 







4 















20 



628 







5 















20 



626 

















100 



31-27 















Means 





1 



31-27 







The only difference between the details of these and 

 former experiments consisted in one-half of needle C 

 being covered by several folds of paper, while the other half 

 was exposed to the Traverses of the focus of concentrated 

 light. In order that the results obtained in the present 

 branch of our enquiry may be exhibited at one view, the 

 following table has been prepared. 



TABLE IX. 



Shewing general results of Experiments on the magnetic action of unde com- 

 posed Solar Light, with needles having brightly polished surf aces. 

















Sh 

















O £j 



o £5 • 









is 

 ^3 



jngth o 

 Needle 



im. c 



§-•« 



f - § 



ttion 

 ill. a 

 Exp. 



ition 

 ill. a 

 Exp 



Remarks. 



o 





<D 

 CD 







lis 



Bis 





to 



« 



to 





Q 











Jan. 



















1842 

















l 



10th 



A 



4 



0-05 



19-15 



19-94 





These observations were not 



2 



12 



B 



4 



0-05 



15-011 



15-03 



15.322 



all made on the same day, as 



3 



19 



O 



5 



0-04 



30-75 



30-77 



31 27 



will be seen in the table of de- 

 tails for each. They are how- 



they had been so, for the pur- 

 Ipose of clear comparison. 



From this table, it is perfectly clear that no increase 

 whatever of magnetic intensity had taken place in the 

 needles A B and C, in consequence of their exposure to 

 direct undecomposed solar light, a result in accordance with 

 those of other observers, none of whom have ever succeeded 



2l 



