Edison's Phonograph. In 1877 Thomas Edison filed a patent on a machine that could record and play back sound. He demonstrated this simple device by reciting the poem Mary had a little lamb.

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Title: Edison's Phonograph. In 1877 Thomas Edison filed a patent on a machine that could record and play back sound. He demonstrated this simple device by reciting the poem Mary had a little lamb.

Caption: Edison's Phonograph. In 1877 Thomas Edison filed a patent on a machine that could record and play back sound. He demonstrated this simple device by reciting the poem Mary had a little lamb. His voice caused the membrane in the microphone to vibrate. A stylus attached to the membrane drew grooves of varying depth in a sheet of tinfoil wrapped around a rotating cylinder which moved along the microphone with the stylus.

Credit: Album / World History Archive

Releases: ? Model Release: No - ? Property Release: No
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Image size: 4123 × 5086 px | 60.0 MB

Print size: 34.9 × 43.1 cm | 1623.2 × 2002.4 in (300 dpi)

Keywords: COMMUNICATION • MICROPHONE • PHONOGRAPH • TELEPHONE • THOMAS EDISON • VOICE