Reginald Fessenden
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Reginald Aubrey Fessenden was a Canadian-American electrical engineer and inventor who received hundreds of patents in fields related to radio and sonar between 1891 and 1936.
Fessenden in 1903
Whitney Institute in Bermuda, founded in 1881, of which Fessenden was headmaster
Located near Fessenden's birthplace, this plaque was installed by the Historic Sites and Monuments Board of Canada
It reviews his telecommunications and submarine detection work
Coherer
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The coherer was a primitive form of radio signal detector used in the first radio receivers during the wireless telegraphy era at the beginning of the 20th century. Its use in radio was based on the 1
Marconi's 1896 coherer receiver, at the Oxford Museum of the History of Science, UK. The coherer is on right, with the decoherer mechanism behind it. The relay is in the cylindrical metal container (center) to shield the coherer from the RF noise from its contacts.
The circuit of a coherer receiver, that recorded the received code on a Morse paper tape recorder.
A radio receiver circuit using a coherer detector (C). The "tapper" (decoherer) is not shown.
A coherer with electromagnet-operated "tapper" (decoherer), built by early radio researcher Emile Guarini around 1904.