Abstract
Two researches on singing condensers, such as that employed in Varley's telephone, have lately been published. M. R. Chavannes, in the first of these, maintains that undulatory currents produce no sounds in such condensers; that intermittent currents are absolutely necessary. M. Trève has shown, in the second, that a pressure exerted upon the leaves of the condenser sufficient to drive out the air from between them will destroy the production of the tones; and that if the condenser is placed in an exhausted chamber it ceases to emit sounds.
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Physical Notes . Nature 21, 359–360 (1880). https://doi.org/10.1038/021359b0
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DOI: https://doi.org/10.1038/021359b0