XXXI. Studies in the photometry of lights of different Colours.—II. Spectral luminosity curves by the method of critical frequency

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(1912). XXXI. Studies in the photometry of lights of different Colours.—II. Spectral luminosity curves by the method of critical frequency. The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science: Vol. 24, No. 141, pp. 352-370.