However, by the late 1920s, radios using crystal detectors were relegated to use by hobbyists and youth groups and have been used by them as educational devices to the present day.
22.
"' Cryogenic crystal detectors "'- A technique used by the Cryogenic Dark Matter Search ( CDMS ) detector at the Soudan Mine relies on multiple very cold germanium and silicon crystals.
23.
During the war, Riordan and Hoddeson say, scientists at AT & T's Bell Laboratories and in England discovered that highly purified silicon could be used in crystal detectors to detect high-frequency radar signals.
24.
A "'cat's-whisker detector "'( sometimes called a "'crystal detector "') is an antique electronic component consisting of a thin wire that lightly touches a crystal of semiconductor electronic devices ( after photoconductors ).
25.
During the war, Riordan and Hoddeson say, scientists at AT & AMP; T's Bell Laboratories and in England discovered that highly purified silicon could be used in crystal detectors to detect high-frequency radar signals.
26.
The crystal detector was developed into a practical device for wireless telegraphy by Greenleaf Whittier Pickard, who invented a silicon crystal detector in 1903 and received a patent for it on November 20, 1906.
27.
The crystal detector was developed into a practical device for wireless telegraphy by Greenleaf Whittier Pickard, who invented a silicon crystal detector in 1903 and received a patent for it on November 20, 1906.
28.
A "'rectifier "'is an electrical device that cat's whisker " of fine wire pressing on a crystal of galena ( lead sulfide ) to serve as a point-contact rectifier or " crystal detector ".
29.
The temperamental, unreliable action of the crystal detector was a barrier to its acceptance as a standard component in commercial radio equipment and was one reason for its rapid replacement by vacuum tubes after 1920.
30.
These in turn were replaced by the crystal detector around 1906, and then around 1912 by vacuum tube technologies such as John Ambrose Fleming's thermionic diode and Lee De Forest's Audion ( triode ) tube.
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