IEEE

Phonograph

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'''''This article is a stub. You can help the GHN by expanding it.'''''  
 
'''''This article is a stub. You can help the GHN by expanding it.'''''  
  
Menlo Park, New Jersey. Using ideas he mentioned in a patent for telephony improvements filed on 30 July 1877 (the recording of sound by transverse indentations in a v-shaped groove in a paper tape or on a sheet of tinfoil wrapped on a cylinder), Edison drew a sketch for the phonograph on 29 November 1877 that was used to make a working model a few days later. The device was demonstrated to Scientific American on Dec. 7. Edison filed for a patent on Dec 15th. And the invention was announced publicly in Scientific American on Dec. 22nd.
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[[Thomas Edison at Menlo Park|Menlo Park, New Jersey]]. Using ideas he mentioned in a patent for telephony improvements filed on 30 July 1877 (the recording of sound by transverse indentations in a v-shaped groove in a paper tape or on a sheet of tinfoil wrapped on a cylinder), [[Thomas Alva Edison|Edison]] drew a sketch for the phonograph on 29 November 1877 that was used to make a working model a few days later. The device was demonstrated to Scientific American on Dec. 7. Edison filed for a patent on Dec 15th. And the invention was announced publicly in Scientific American on Dec. 22nd.  
  
[[Category:Power%2C_energy_%26_industry_application]]
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[[Category:Power,_energy_&_industry_application|Category:Power,_energy_&_industry_application]] [[Category:Consumer_electronics]] [[Category:Audio_systems]]
[[Category:Consumer_electronics]]
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[[Category:Audio_systems]]
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Revision as of 20:34, 2 February 2009

This article is a stub. You can help the GHN by expanding it.

Menlo Park, New Jersey. Using ideas he mentioned in a patent for telephony improvements filed on 30 July 1877 (the recording of sound by transverse indentations in a v-shaped groove in a paper tape or on a sheet of tinfoil wrapped on a cylinder), Edison drew a sketch for the phonograph on 29 November 1877 that was used to make a working model a few days later. The device was demonstrated to Scientific American on Dec. 7. Edison filed for a patent on Dec 15th. And the invention was announced publicly in Scientific American on Dec. 22nd.