Category:Microphones in the 1900s

Media in category "Microphones in the 1900s"

The following 8 files are in this category, out of 8 total.

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  Byng telephone microphone (Rankin Kennedy, Electrical Installations, Vol V, 1903).jpg 546 × 467; 30 KB
  
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  De Forest 1909 arc radiotelephone.jpg 1,340 × 1,888; 484 KB
  
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  HughesMicrophone.gif 330 × 278; 6 KB
  
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  Microphone wireless detector 1909.png 513 × 387; 111 KB
  
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  PSM V70 D321 Two piece telephone ear and speaker set.png 1,185 × 957; 183 KB
  
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  Telefon Hirmondo - Stentor reading the day's news.jpg 1,197 × 1,112; 338 KB
  
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  Telefunken arc radiotelephone.jpg 1,095 × 2,135; 568 KB
  
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  The practical telephone handbook and guide to the telephonic exchange (1906) (14776132053).jpg 1,568 × 1,360; 655 KB