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Coherer

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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.'''''  
  
Paris, France. On 24 November 1890, Édouard Branly invented the Coherer, a device important in the early development of wireless telegraphy. The device, a glass tube with terminals containing metal filings, acts as an insulator unless acted upon by an electric spark, when it becomes a conductor. Tapping the device separates the filings and it again becomes an insulator.
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Paris, France. On 24 November 1890, Édouard Branly invented the Coherer, a device important in the early development of [[Wireless Telegraphy|wireless telegraphy]]. The device, a glass tube with terminals containing metal filings, acts as an insulator unless acted upon by an electric spark, when it becomes a conductor. Tapping the device separates the filings and it again becomes an insulator.  
  
[[Category:Communications]]
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[[Category:Communications]] [[Category:Telegraphy]]
[[Category:Telegraphy]]
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Revision as of 19:50, 29 January 2009

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

Paris, France. On 24 November 1890, Édouard Branly invented the Coherer, a device important in the early development of wireless telegraphy. The device, a glass tube with terminals containing metal filings, acts as an insulator unless acted upon by an electric spark, when it becomes a conductor. Tapping the device separates the filings and it again becomes an insulator.