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Galena cat whisker detector used in early crystal radio Precision crystal detector with iron pyrite crystal, used in commercial wireless stations, 1914. The crystal is inside the metal capsule under the vertical needle (right). The leaf springs and thumbscrew allow fine adjustment of the pressure of the needle on the crystal.
Type 'C' Form 'A' twin detector crystal radio set, manufactured by British Thomson Houston Ltd. in 1924, kept at the Museum of the radio - Monteceneri (Switzerland) Early radio telegraphy used spark gap and arc transmitters as well as high-frequency alternators running at radio frequencies. The coherer was the first means of detecting a radio ...
During the early years of the 20th century, pyrite was used as a mineral detector in radio receivers, and is still used by crystal radio hobbyists. Until the vacuum tube matured, the crystal detector was the most sensitive and dependable detector available—with considerable variation between mineral types and even individual samples within a ...
Greenleaf Whittier Pickard (February 14, 1877 – January 8, 1956) was an American electrical engineer and inventor. He was largely responsible and most famous for the development of the crystal detector, the earliest type of diode detector, although he was not the earliest discoverer of the rectifying properties of contact between certain solid materials. [1]
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The bodies of all 10 people who died in a crash of a Bering Air caravan in Alaska on Thursday have been recovered from the wreckage, according to the Alaska State Troopers. Bering Air Flight 445 ...
The set was compact and mounted in a wooden box, type BC-14. The lid of the box held the buzzer circuit, detectors, a screwdriver, two P-11 telephone headsets, spare parts, extra crystals, and an operating manual, “Radio Pamphlet No. 3”. [2] The receiver was intended to be used with antenna type A-2 or A-2-B.
The Jane Doe accuser alleges that around 1999, when she was working as a model and promotional employee for a radio station, she attended a VIP party hosted by Combs in New York City.