| 11. | This was in spite of some carbon microphones used, which had resonances that colored the recorded tone.
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| 12. | Including the quadruplex telegraph, the carbon microphone, phonograph, incandescent light bulb and system of electric lighting.
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| 13. | Alexander Graham Bell hired Blake and put him to work with Emile Berliner who also invented a carbon microphone.
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| 14. | Carbon microphones found use as early telephone repeaters, making long distance phone calls possible in the era before vacuum tubes.
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| 15. | The first microphone that enabled proper voice telephony was the ( loose-contact ) carbon microphone ( then called transmitter ).
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| 16. | In 1878, David E . Hughes noticed that sparks could be heard in a telephone receiver when experimenting with his carbon microphone.
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| 17. | The passive hydrophones of the Imperial Japanese Navy were based on moving coil design, Rochelle salt piezo transducers, and carbon microphones.
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| 18. | He moved back to London in 1857 and further pursued experimentation and invention, coming up with an improved carbon microphone in 1878.
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| 19. | To pick up the programmes, multiple large carbon microphones were placed in the theatre footlights to pick up the sounds of the performers.
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| 20. | The frequency response of the carbon microphone, however, is limited to a narrow range, and the device produces significant electrical noise.
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