Vacuum arc spectra of various elements in the extreme ultra-violet

Abstract
In the prosecution of the work on ionisation potentials recently set in train by one of us, it became of importance to extend the development to include an examination of the series spectra of certain of the elements farther down in the ultra-violet region than was accessible with an optical system of quartz. In order to carry out this extension of the work, a small 60° prism and two bi-convex lenses of about 15 cm. focal length for the visible range of wave-lengths, all of good quality fluorite, were made for us by the Adam Hilger Co., and these optical parts were used in the construction of a spectrograph made up in the laboratory workshop of the University of Toronto, after our own design.

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