A High Intensity Discharge Tube

Abstract
A high intensity discharge tube is constructed by placing a small constriction in a direct‐current arc. The direct current is supplied by mercury vapor rectifiers. The tube has been operated with the rare gases, oxygen, hydrogen and nitrogen. With hydrogen the ultraviolet continuous spectrum is very strong and this tube should be a good source for absorption spectra in that region. The use of a wedge lens is also described.

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