[ainsue-fuller] ultra-violet OF CERTAIN METALS 



Band Spectrum of Carbon 



71 



Iron 



The vacuum arc spectrum of iron was obtained by using iron 

 terminals in the vacuum arc lamp. A current of 15 amperes was 

 used, but even with this high current the arc was intermittent and 

 not very bright, which made it difficult to get a good photograph of 

 the spectrum. 



B. Bloch, Journal de Physique, 5 Série, p. 628, 1914. 



