An elementary manual of radiotelegraphy and radiotelephony for students and operators (1916)
Fleming, J. A. (John Ambrose), Sir, 1849-1945 · London, Longmans, Green & co. · leaf 361
,ement will act asa magnifier of telephonic speech. It is well known that if amicrophone, battery, and telephone receiver are connected in seriesthat when the receiver is approached to the transmitter thearrangement begins to sing spontaneously and emits a musical note. … Pig. 10. The explanation of ihis is as follows: Stray sounds start thediaphragm of the transmitter in vibration. This starts thereceiver diaphragm vibrating and it emits a sound. This soundincreases the amplitude of the transmitter vibrations, and so thetwo act and react on each other until a loud…
Radio · Telegraph, Wireless · Telephone, Wireless
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