Abstract
II. IN the preceding article we traced the history and development of the magneto-telephone. This instrument, even if it served.no other purpose, has given to physicists a galvanoscope of surpassing delicacy. In the columns of this journal (vol. xvii. p. 343) Prof. Forbes showed how the feeblest thermo-electric currents could be detected by its means, whilst the subsequent discovery of the microphone was but another application of the same fact. This latter instrument and the early history of the carbon telephone we now propose to consider.
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BARRETT, W. The Telephone, its History and its Recent Improvements 1 . Nature 19, 12–14 (1878). https://doi.org/10.1038/019012a0
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DOI: https://doi.org/10.1038/019012a0