[ainslie-fuller] 



ULTRA-VIOLET OF CERTAIN METALS 



75 



Nickel. 



The vacuum arc spectrum of nickel was obtained in a similar 

 manner to that of iron. Nickel alone was put in the terminals of 

 the vacuum arc lamp. The current used was 7 amperes, when the 

 curcuit was closed. This gave a strong intermittent arc. A large 

 number of sharp and well-defined lines appear in the nickel spectrum 

 in this region. 



