Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLI. No. 10. — July, 1905. 



THE RELATIVE POSITIONS OF THE ARC AND SPARK 



LINES OF THE SPECTRA OF TITANIUM, 



ZINC, AND IRON 



By Norton A. Kent. 



With a Plate. 



Investigations on Light and Heat made or published, wholly or in paet, with Appropriations 

 from the Rumford Fund. 



