Mahoganyframe with aslidecoil,
wrapped around acardboard
over the coil by meansalarge knob.
At the top arethe connectionsfor headphones,an antenna and aground,as
well as aC. & J.ArrigoniMic-Metcrystal detector, together with
a coil holder
additionalcoil, whichincreases the rangeof thelong
wave.The receiver iswired with
It is probably a home made device, used to listen to
station 5XX in Chelmsford. This station started regular
broadcasts in June 1924.
The C. & J. Arrigoni
& Co. Mic-Met crystal detector consists of 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.
Mic-Met was derived from the word micrometrical. The
original price of the detector was 6 shilling (postal