Magnetic Influence of Solar Light. 



381 



TABLE VIII. 



Shewing Duration of Oscillations of Testing Needle, with Cylinder H in 

 front, before and after exposure. 



Medium Purple Silk. 



CL, 



o 



Hours of 

 Expos. 



From 

 a. m. 



To 



o 



s s 



go 



WW 



Temp. 



Duration of 

 Oscillation. 



Before 

 Expos. 



After 

 Expos 



Remarks. 



Feb. 

 22d. 



II 



In. 



2 



In. 



0.05 



72 



88 



95 

 95 

 96 

 95 

 95 



95 

 94 

 94 

 95 

 94 



Sums 

 Means .., 



476 



472 



95.2 



94.4 



TABLE IX. 



Shewing Duration of Oscillations of Testing Needle, with Cylinder I in 

 front, before and after exposure. 



Medium Grey Silk. 



o 



© 



eS 



Q 



Hours of 

 Expos. 



From 



A. M. 



To 



P. M 



O 



o 



3° 



Temp. 



0) m 

 ft ° 



0) o 



±J Oh 



Duration of 

 Oscillations. 



Before 

 Expos. 



After 

 Expos. 



Remarks. 



Feb. 

 22d. 



HI 



In. 



2 



In. 

 0.05 



72o 



90° 



90 

 91 

 91 

 91 

 91 



91 

 90 

 91 

 91 

 91 



Sums 



Means 



50 



454 



454 



10 



90.8 



90.8 



This series gives the Duration of Oscillations before and 

 after Exposure identically the same, the time being three 

 hours, and the difference of temperature 18°. 



