Hatfield wrote:

Foxhole radio used a razor blade for the rectifier, a safety pin and a
#2 pencel led for cat whisker. The Gillette Blue Blade brand got their
color from factory fire hardening which made the surface a
semiconductor. Old stock blades are always available very cheaply on
EBAY, I don't know where in the world else???. Authentic WWII era are
single edge.



http://www.gizmodo.com/archives/imag...adio_planz.jpg

I tried making a foxhole radio when I was a kid from plans I found in a
1950s book. I never could get it to work, though. Probably because I had
a modern razor blade, the book didn't mention anything about the
specific brand of blade.


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