Abstract
IN the December number of the Bell Laboratories Record, Mr. H. C. Montgomery, of the Acoustical Research Department of the Bell Laboratories, discusses results obtained by subjecting many of the visitors at the World's Fairs to tests of the quality of their hearing. The records obtained enabled him to get nearly three-quarters of a million of records carried out in the same way.
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Hearing Tests. Nature 145, 79 (1940). https://doi.org/10.1038/145079a0
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DOI: https://doi.org/10.1038/145079a0