Crystal detector, using two minerals kept in contact with a spring and adjusting knob. Used in radios. Made by the Radial Electrical Co. Ltd., London, England.

Early researchers looked for junctions that were more stable and less sensitive to vibration. The 'cat's whisker' type was replaced by more permanent spring-loaded contacts, using carborundum.This is probably an example of a Perikon detector.

Physical Description

The parts of a crystal detector have been separted and mounted on a display block. The parts include a brown fibre cylinder, a threaded end cal with terminal containing a piece of mineral, and another threaded cap holding a spring-loaded plunger with a crystal at one end and a knob at the other.

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