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Note added October 3rd, 1923.—The writer is not unaware that the work of this paper and that of part of the previous one on intensity measurements are intimately connected with the general subject of photographic density on which extensive investigations have been and are being made. In view of the expressed aims of the papers, it has not been considered necessary to give references to the literature in this field with much of which, indeed, the writer does not profess great familiarity.
Graph in which length of spectral line λ5015 is plotted against (1) time of exposure, (2) log of time of exposure.
Table XII Value of Schwarzschild Constant
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