Crystal detector. A "Perikon" unit. In order to form a rectifying junction, two minerals, zincite and bornite, are brought into contact in a tube. Made by Grasse & Daniell, Sydney, Australia. Used in radios.

Physical Description

Brass mechanism with glass tube with black insulating caps between two metal plungers containing two mineral pellets Item is mounted on an insulating plate, which, in turn, is mounted on a display block with label.

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