Abstract
IN NATURE, vol. xvii. p. 164, there was a notice of a telephonic alarum in the shape of a tuning-fork. This, however, requires a fixed and special telephone. The following method of attracting attention requires neither. I venture to send it you, as I have seen no notice of any one having tried it; but I can scarcely believe it to be the case, as the thing would suggest itself to any one studying the instrument. It is to include a magneto-electric machine in the circuit, when turning the handle produces a series of taps in the telephone audible at a considerable distance. I have not tried it for any long distance—merely fifty yards. The magneto-electric machine was placed in the observatory, and the telephone, or rather a battery of three telephones, in my study. The noise was heard at the further end of my dining room, the door of which faces that of the study.
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SMITH, A. The Telephone. Nature 17, 380 (1878). https://doi.org/10.1038/017380c0
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DOI: https://doi.org/10.1038/017380c0
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