Abstract
1. IF the cavities above and below the iron disc of an ordinary telephone are filled with wadding, the instrument will transmit and speak with undiminished clearness.
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DE RATTI, A. The Telephone. Nature 17, 380 (1878). https://doi.org/10.1038/017380b0
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DOI: https://doi.org/10.1038/017380b0
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