Abstract
OF the many ingenious forms the microphone has taken—and I believe I am acquainted with most of them—none is, I think, more efficacious than the one I offer for your inspection. The jarring sound in the principal instruments in use, which, by vibration, may emanate from passing vehicles, &c., is entirely obviated, and the sound of a piece of fine silken thread, or the now well-known tramp of a fly, is heard with double the distinctness of any microphone I have listened to.
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FRANCIS, G. [Letters to Editor]. Nature 18, 383 (1878). https://doi.org/10.1038/018383c0
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DOI: https://doi.org/10.1038/018383c0
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