Francis Blake

Francis Blake
Född25 december 1850
Needham, Massachusetts, USA
Död20 januari 1913
Boston, Massachusetts
MedborgarskapUSA
NationalitetUSA
ForskningsområdeTeleteknik

Francis Blake, född 1850 i Needham, Massachusetts, USA, död 20 januari 1913 i Boston, Massachusetts,[1] var en amerikansk uppfinnare. Blake var direktör för American telepone and telegraph co., och uppfinnare av bland annat Blakes mikrofon 1877 och Blakeska telefonapparaten 1878. Hans telefonmodell var mycket spridd i USA och Storbritannien och användes även i Sverige på 1880- och 1890-talen.

Biografi

Blake var son till Caroline Burling (Trumbull) och Francis Blake, sr. Han arbetade på USA:s kustbevakning från tonåren till tidig vuxen ålder (1866-1878). Han var fysiker men också amatörfotograf. År 1877 uppfann Blake en kolmikrofon för användning i telefonen och patenterade den innan Thomas Edison uppfann en liknande mikrofon, som också använde kolkontakter. Blake använde en kolknappskonstruktion som ursprungligen inte skulle gå att hålla i stabil justering, men med senare förbättringar visade sig fungera. Alexander Graham Bell anlitade Blake och fick honom att arbeta med Emile Berliner som också uppfann en kolmikrofon. Den förbättrade Berliner-Blake-mikrofonen var standard hos Bell-företaget under många år.[2]

År 1874 gifte sig Blake med Elizabeth Livermore Hubbard (1849 -1941) vars far tillhandahöll mark i Weston, på vilken Blake planerade och byggde ett anpassat hus där han genomförde sina elektriska experiment. De hade två barn: Agnes (Blake) Fitzgerald (f. 1876) och Benjamin Sewall Blake (f. 1877).

Blake valdes till medlem i American Antiquarian Society år 1900.[3]

Patent

  • Kanadensiskt patentet 10021 för telefonsändare, beviljat 28 maj 1879, ogiltigt den 3 mars 1887 på grund av brister i tillverkningen av telefondelar i Kanada.
  • USA-patent beviljat 1881

Referenser

Den här artikeln är helt eller delvis baserad på material från engelskspråkiga Wikipedia, tidigare version.
  • Lewis Coe, The Telephone and its Several Inventors, McFarland Publishers, 1995.
  • Elton W. Hall, Francis Blake: An Inventor's Life, Massachusetts Historical Society, 2004

Noter

  1. ^ ”Francis Blake is Dead”. The Marshfield News (Boston): s. 2. 1913-01-30. https://www.newspapers.com/clip/48235902/francis-blake-is-dead/. 
  2. ^ Coe, pages 22, 33, 76
  3. ^ American Antiquarian Society Members Directory

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