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Sixty lines in the spectrum of the vacuum zinc arc have been observed in the wave-length range 2178A to 7799A. All known solar zinc lines, including two not hitherto listed, are included. A suitable source for obtaining weak lines in vacuum is described. The stronger lines of the following elements were observed: Pb, Cu, Cd, Ag, Sn, Na, K, Rb, Cs, Sr, Be. The observations were made by means of the F and P interferometer, and by various gratings and prisms.
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Hetzler et al. (1935) studied this question.
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