Brian,There certainly are lots of articles out there...
Have you seen John Campbell's article on detectors at
http://books.google.com.au/books?id=PyEDAAAAMBAJ&pg=PA206&dq=%22Popular+Science%22++%22foxhole+radio%22&hl=en&sa=X&ei=VM2OT6u0JJGVmQWnw5SPDA&redir_esc=y#v=onepage&q&f=false
Popular Science October 44 (see page 209)
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Re adverts:
Searching Google books on ["Popular Science" "foxhole radio"] turns up two small text only adverts.
FOXHOLE radio: — amazing serviceman's pastime gift batteryless. tubeless. schoolboy thrill, made anywhere, anybody. Easy distance-getting instructions.
$2.00. Gadgets. Box 28 Jackson Heights
and
FAMOUS "Foxhole" radio — plays anywhere. Plans, quarter. National, 322M Union Avenue, Brooklyn 11.
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Yes, it would be great to see these old plans...
later ........ Zim
Edited by - gzimmer on 4/18/2012 9:56:51 AM