Abstract
IN NATURE of June 21, p. 896, there is a reference to the instruments exhibited under my name in the Royal Society's section in the Government Pavilion at the British Empire Exhibition dealing with the measurement of atmospheric pollution. I should like to make it clear that the credit for the original idea underlying the contrast photometer exhibited is due to Mr. L. F. Richardson. It is a development of the method described by him in the Proceedings of the Royal Society, A, vol. 96, 1919. The principle was further elaborated by the Photometric Sub-Committee of the Advisory Committee on Atmospheric Pollution, my share being only that of getting out a workable design and making the experimental instrument. I was fortunate in getting at the first attempt an instrument with remarkable sensitiveness and accuracy, which required practically no alteration and enabled a measure of light obstruction by fog to be obtained.
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OWENS, J. Exhibit of Pure Science at the British Empire Exhibition. Nature 114, 12 (1924). https://doi.org/10.1038/114012b0
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DOI: https://doi.org/10.1038/114012b0
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