THE 

 LONDON, EDINBURGH, and DUBLIN 



PHILOSOPHICAL MAGAZINE 



AND 



JOURNAL OF SCIENCE. 



[FIFTH SERIES.] 



AUGUST 1879. 



XL Electro-optic Observations on various Liquids. By John 

 Kerr, LL.D., Free Church Training College, Glasgow* '. 



IN two short papers winch were published some years ago, 

 I showed how I had succeeded in inducing a power of 

 double refraction in glass, carbon disulphide, and several other 

 dielectrics, by the application of electric force f. In this paper 

 I propose to offer some notes of a later and more extended 

 series of experiments on the same subject. The methods 

 applied are, for the most part, much the same in principle now 

 as formerly ; but my means of observation have been greatly 

 amplified and improved, chiefly by assistance from the Govern- 

 ment Fund. I begin with the construction of the most im- 

 portant part of the apparatus. 



1. New Plate Cell. — This piece is represented in the adja- 



cent diagram. It is made of a block of carefully selected 



* Communicated by the Author. 



t " On a new Relation between Electricity and Light/' Philosophical 

 Magazine, November and December 1875. 



Phil. Mag. S. 5. Vol. 8. No. 47. August 1879. H 



