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Charles Apgar
Charles Apgar (died August 17, 1950) was an American amateur radio operator who is known for making the earliest surviving recordings of a radio signal in 1914. He was 85 years old when he died in 1950.
==Apgar's equipment==
Apgar fitted the electrical element of a headphone to a home-made recording head he attached to an Edison cylinder phonograph. This Rube Goldberg machine allowed him to record Morse code radio signals picked up by his receiver on wax cylinders. He made at least a dozen such recordings before 1915. In that era there were few radio stations to record, so most recordings made by Apgar are relatively pedestrian. He mostly recorded Morse code news bulletins from WHB in Manhattan.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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