76 



THE ROYAL SOCIETY OF CANADA 



Int. 



Va 



AE.&.V. 



Bloch has also measured the spectrum of Nickel down to A1851^ 

 He has measured a great number of lines not obtained in this work. 

 The strong lines of his spectrum correspond fairly well with the strong 

 lines measured above. 



Cobalt. 



The vacuum arc spectrum of Cobalt was obtained by putting 

 cobalt in iron terminals. The current used was about 12 amperes 

 when the circuit was closed. This gave an intense intermittent arc. 

 The spectrum obtained was similar to that of iron and showed up 

 lines that belonged to Carbon. Eder and Valenta's work covers the 

 lines measured in this work down to A2173-44. Bloch has also made 



'Journal de Physique, 5 Série, p. 631, 1914. 



