Abstract
IN connexion with the contribution by Messrs. King and Maguire to this subject in NATURE of June 4, p. 1016, it may be of interest to refer to a very similar method of calibration which has been in use by the Research Branch of the Post Office Engineering Department since 1933.
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References
West, W., Post Office Elec. Eng. J., 26, 260 (Jan. 1934).
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WEST, W. Free Field Calibration of Microphones. Nature 142, 39 (1938). https://doi.org/10.1038/142039b0
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DOI: https://doi.org/10.1038/142039b0