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Crystal Detector - Unknown Maker, Variable, circa 1916 Reg. No: ST 021766
- Detector for use in crystal radio receiver, with mechanical adjustment, circa 1916.
This unit is professionally made and 'is a German pattern detector said to have been used before World War I and afterwards to receive the Braybrook Broadcasting Station (inaugurated 13 October 1924 by Madame Melba).'
- The crystal is mounted in a brass cup on a wooden base plate. A brass spring loaded wire holder allows a delicate contact to be made between crystal and wire.
Multiple registration numbers physically joined. This object is physically attached to a display board with ST 15415.
Note: Crystal is probably galena (Lead Sulphide). Carborundum is unlikely to have been used at this time. It requires a battery to make it operational.
- Acquisition Information:
- Donation from E. Chambers, 1942
|Dimensions:||70 mm (Height), 65 mm (Width), 113 mm (Length)|
|Tagged with:||world war i 1914-1918, radios, electrical components|
|Themes this item is part of:||Information & Communication Collection, Radio from sparks to valves, 1914 - 1920|
|Inscriptions:||None on detector.
Display board: EARLY SEMICONDUCTOR DEVICES / THE COHERER - 1905 / THE CRYSTAL DETECTOR - 1920 / A crystal of CARBURUNDUM (Silicon Carbide) in point / contact with a wire called a CAT'S WHISKER rectified / incoming RADIO FREQUENCY SIGNALS.
Note: Carborundum is misspelt on display board.
|Date Made:||circa 1916|