• DocumentCode
    1261210
  • Title

    Subsequent developments in telephone instruments

  • Author

    Richards, D.L. ; Connolly, D.C.A.

  • Author_Institution
    General Post Office, Research Department, Telephony, Transmission Performance Section, London, UK
  • Volume
    22
  • Issue
    3
  • fYear
    1976
  • fDate
    3/1/1976 12:00:00 AM
  • Firstpage
    168
  • Lastpage
    172
  • Abstract
    One of the most fruitful inventions in telephony took place at Bolton Percy, Yorkshire. A country curate discovered that crushed coke made a very good material for a variable-resistance microphone. That was in 1878. By 1957, the microphone and earphone that are used in almost all British Post Office telephone sets today were developed
  • fLanguage
    English
  • Journal_Title
    Electronics and Power
  • Publisher
    iet
  • ISSN
    0013-5127
  • Type

    jour

  • DOI
    10.1049/ep.1976.0079
  • Filename
    5183204
    • Link To Document
    https://search.isc.ac/dl/search/defaultta.aspx?DTC=49&DC=1261210