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Crystal Detector - Unknown Maker, Variable, circa 1916 Object Reg. No: ST 021766

Summary:
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).'
Description:
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
Discipline: Technology
Dimensions: 70 mm (Height), 65 mm (Width), 113 mm (Length)

More information

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
Primary Classification: COMMUNICATIONS
Secondary Classification: Radio
Tertiary Classification: receivers
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

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