Cymosite Detector Crystal for crystal radio sets

A. Franks Ltd
Cymosite Detector Crystal

cymosite detector crystal

The Cymosite Super Sensitive detector crystal from the early 1920’s.  Crystals were used in conjunction with a cats whisker (a thin wire that lightly touched the surface of the crystal).  A scan of the instruction leaflet is shown below.

A. Franks Cymosite crystal

A. Franks Cymosite crystal