Left
near the rear wall, a very rare Russian plug-in
detector unit is displayed. Made in 1914, it was so-called
Perikon Detector developed by G. W. Pickard. This
type of detector consists of two different crystals, copper
pyrites and zincite, held in firm contact against each other
to produce rectifying effect.
The
rest of display contains foreign crystal sets and
accessories of 1924-1936. Detailed pictures of the items
displayed may be found in "Crystal
Sets and Accessories" section of our Broadcast Receiver
Collections.
