C. & J. Arrigoni
Mic-Met Crystal Detector
A cats whisker and crystal detector in a glass enclosure with nickel plated brass fittings. The position of the cats whisker can be altered by turning the small threaded screw which in turn moves the whisker closer or further away from the crystal. Both the crystal and the whisker can be removed from the glass enclosure by unscrewing the larger threaded knurled fittings either end.
The advert shown below is taken from “The Wireless Constructor” dated December 1924. The advert states the selling price was 6 shillings if ordered direct from the manufacturer.