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  2. Phonautograph - Wikipedia

    en.wikipedia.org/wiki/Phonautograph

    The phonautograph is the earliest known device for recording sound.Previously, tracings had been obtained of the sound-producing vibratory motions of tuning forks and other objects by physical contact with them, but not of actual sound waves as they propagated through air or other mediums.

  3. James West (inventor) - Wikipedia

    en.wikipedia.org/wiki/James_West_(inventor)

    Along with Gerhard Sessler, West invented the foil electret microphone in 1962 while developing instruments for human hearing research. [ 7 ] [ 8 ] Compared to the previous condenser microphones, the electret microphone has higher capacitance and does not require a DC bias. [ 9 ]

  4. David Edward Hughes - Wikipedia

    en.wikipedia.org/wiki/David_Edward_Hughes

    David Edward Hughes (16 May 1830 – 22 January 1900), was a British-American inventor, practical experimenter, and professor of music known for his work on the printing telegraph and the microphone. [3]

  5. Timeline of electrical and electronic engineering - Wikipedia

    en.wikipedia.org/wiki/Timeline_of_electrical_and...

    German scientist Johann Philipp Reis invented the Microphone: 1862: Scottish physicist James Clerk Maxwell published the four equations bearing his name 1866: The Transatlantic telegraph cable: 1873: Belgian engineer Zenobe Gramme who developed the DC generator accidentally discovered that a DC generator also works as a DC motor during an ...

  6. Microphone - Wikipedia

    en.wikipedia.org/wiki/Microphone

    The condenser microphone, invented at Western Electric in 1916 by E. C. Wente, [22] is also called a capacitor microphone or electrostatic microphone—capacitors were historically called condensers. The diaphragm acts as one plate of a capacitor, and audio vibrations produce changes in the distance between the plates.

  7. History of the camera - Wikipedia

    en.wikipedia.org/wiki/History_of_the_camera

    In the 1830s, the English scientist William Henry Fox Talbot independently invented a process to capture camera images using silver salts. [ 12 ] : 15 Although dismayed that Daguerre had beaten him to the announcement of photography, he submitted a pamphlet to the Royal Institution entitled Some Account of the Art of Photogenic Drawing on 31 ...

  8. Raymond A. Litke - Wikipedia

    en.wikipedia.org/wiki/Raymond_A._Litke

    Raymond A. Litke (1920-1986) was an American electronic engineer, the inventor of a practical wireless microphone, and the first to patent the wireless microphone.He was born and raised on a farm near Alma, Kansas, but spent most of his adult life in San Jose, California.

  9. Francis Blake (inventor) - Wikipedia

    en.wikipedia.org/wiki/Francis_Blake_(inventor)

    Francis Blake was born in Needham, Massachusetts on December 25, 1850, the son of Caroline Burling (Trumbull) and Francis Blake, Sr. [1]. In 1879, he invented a carbon microphone for use in the telephone, and patented [2] [3] [4] it shortly after Thomas Edison invented a similar microphone that also used carbon contacts.