Abstract
MR. IRWIN G. PRIEST has been good enough to send me a copy of the above letter concerning the description, in my recent book “Photometry”, of the instrument developed by him for heterochromatic photometry (pp. 244–5).
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WALSH, J. Modern Photometry. Nature 120, 157 (1927). https://doi.org/10.1038/120157a0
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DOI: https://doi.org/10.1038/120157a0
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