Abstract
IN a paper read by H. R. Harbottle to the Institution of Electrical Engineers on April 8, a brief description is given of some of the work carried out in the research section of the British Post Office. He begins by discussing electro-acoustic and acousto-electric measurements of instruments. He next describes voice-ear measurements on microphones and receivers, and finally deals with mechanical tests by means of which rapid acceptance tests can be made and estimates given of the commercial life of instruments.
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Acoustic and Telephone Measurements. Nature 129, 731 (1932). https://doi.org/10.1038/129731a0
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DOI: https://doi.org/10.1038/129731a0