PERIKON DETECTOR No1
This was made for Alan Reeves for his Westinghouse Crystal Receiver which was missing
the detector. I mounted the finished detector on a base as I originally intended
this to be used with other crystal receivers.I have fitted a Galena and Zincite
Crystal to this but many combinations of crystals can be used.
It is essential to make a good electrical contact to the Zincite I used a very thin strip
of sheet pewter which is a very soft metal and cushions the contact with the rather
delicate Zincite.The whole crystal is held in place with a grub screw.
The Galena is held in place with 'Woods metal' another very soft metal alloy which
melts at a lower temperature than Lead and Galena.
The two crystals are held in point contact by a spring loaded shaft and the pressure is
adjustable with the Knurled screw.It is possible to rotate the crystals and move up
and down and side to side on the crystal surfaces in a similar way to a Catswisker.
The Dark Oak stained box measure 6 inches x 4 inches
The size of the detector was a bit of a challenge to make on my old lathe
but i really enjoyed it.
Im looking forward to the next one of these projects as I find these devises very interesting.
If research had continued on these instead of the thermionic valve we may have had the
transistor in the 1920's.and computers by the 30's
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