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