Mr. I. 0. Griffith on the Electricity set free 

 ned by sparking t 



q = 2 x 10~ u ampere. 



302 



A. — Light obtained by sparking between aluminium 

 terminals in air. 



r. 



I. 



E. 



E-rl. 



10 



126 



318 q 



2-52 



S7-6 



8-63 



15-7 q 



1-82 



110-2 



1 



Q 



1-00 



138 



•64 



•43? 



•67 



Several other experiments under similar conditions gave 

 similar results. 



B. — In the following table the initial intensity of the light 

 is reduced in the ratio 1 ; 50 approximately by passing it 

 through water, and it will be noticed that £/I does not 

 increase so rapidly with increasing intensity. The quality 

 of the light is not the same in the two cases as the water has 

 very marked selective absorption and cuts out certain kinds 

 of rays more than others. 



2 

 q= ~ X 10~ ]2 ampere. 



r. 



I. 



E. Eh-L 



10 

 110-2 



126 

 1 



155 q 



1-23 



1-00 



C. — The following table gives the results when the spark 

 took place between iron terminals in an atmosphere of 

 hydrogen. 



r. 



I. 



E. 



E-^L 



10 



126 



225 



1-78 



37-6 



8-63 



11-8 



1-37 



110-2 



1 



1 



1 



1-00 



