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doi: 10.1038/059053a0
PROF. RUNGE, in your last issue, points out that the wave length of the bright green line of krypton is 5570˙4 (Rowland's scale), while that of the auroral line is about 5571. In the paper presented to the Royal Society by Dr. Travers and myself on June 3, the wave-length is given as 55677. The wave-length was re-measured by Mr. Baly on June 7, and its value was found to be 557O˙O. That of the feebler green was 5561˙8, and of D4, the yellow line, 5870˙0. These values, read by means of a grating, are very close to those given by Prof. Runge. We hope to publish photographic measurements of the other lines shortly.
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