294 



The Magnesium and Electric Light [*yr™ki. jES' 



London, answer an excellent purpose, and indeed that their immer- 

 sion -iVth exceeds in defining powers any objective which has as 

 yet come under my notice. 



^ 



In taking photographs'Vith this apparatus, I proceed as fol- 

 lows : — The Electric lamp being set in motion, the table holding 



