Philipp Reis: Inventor of the Telephone

abrupt apparatus armature auditory nerve auditory ossicles battery Bell's British Patent centimetres closing the circuit cloth coils combination of tones conductors constructed contact-pieces corresponding crown 8vo degree of contact demagnetised described Edison edition elastic electric current electric resistance electro-magnet Elisha Gray Engineers exhibited experiments extended surface fixed musical Frankfort Frankfort-on-the-Main Friedrichsdorf galvanic current Garnier Garnier's Institute Giessen given Graham Bell Gray Herr Hochstift Horkheimer human ear human voice imperfect interruptions interruptor inventor iron knitting-needle Legat's Report magnet magnetising mechanical membrane memoir ment metal mitter motion needle opening and closing original oscillations Philipp Reis phonautograph Physical Society plates platinum platinum strip Polytechnisches principle produced Prof Professor Böttger rarefaction Reis's instruments Reis's Telephone reproduced reproduction of tones resistance screw sound sound-waves sounding-board speaking spiral spring steel telegraph tion trans transmit speech transmitter tube tympanum undulations undulatory currents varying vibrations voice wire Yeates