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EARLY CLAIMANTS TO THE HONOUR OF INVENTING
CHARLES BOURSEUL AND PHILIPP REIS
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14th February acoustic telegraph affidavit Alexander Graham Bell American Bell amplitude armature art of transmitting articulate speech battery Bell Company Bell instruments Bell Telephone Company Bell's application Bell's patent Berliner British carbon Centennial Exhibition Charles Bourseul Commissioner of Patents diaphragm Dolbear Drawbaugh drumhead electric circuit electric conductor electric current electric telegraphs Electrical Engineers electrical transmission electrical undulations Electrical World Electrician electrodes electromagnet Elisha Gray Frankfort Glasgow Gray's caveat helix human voice induction coil inventor lampblack liquid transmitter loudspeaker magneto electric McDonough membrane Mercadier mercury Meucci microphone Moncel musical notes musical tones Oliver Heaviside patent application Patent Office permanent magnet Philipp Reis Photophone platinum plumbago Pollok Prescott prior art producing musical rarefactions Reis telephone Reis's rheostats Science Museum Scientific American selenium Sir William Thomson sonorous sound waves sounding box speaking telephone speech transmission Teleg Telegraph Journal telegraph key THOMAS ALVA EDISON transmission of articulate transmission of speech transmit speech transmitting vocal sounds tympanum undulatory current vibrations visible speech Western Union Company WILLIAM AITKEN Willoughby Smith wire