Construction of radio equipment in a Japanese PoW camp
Prisoners in the stalag camps in germany/poland did a trick with a rusty iron surface and a razorblade making a point contact junction diode of some kind, maybe morally closer to a crystal radio coherer. The "foxhole" radio is how its described.The camps in Asia had amazing handicrafts, they made artificial limbs out of bamboo, surgeons tools made out of kitchen implements, colostomies were done and people used mess tins in place of a colostomy sack, "the war diaries of 'weary dunlop'" are well worth reading (Edward Dunlop was a surgeon in changi pow camp)Ronald Searle (a British cartoonist) was also in the camps and drew some truly amazing portraits and scenes.This one in italy: https://www.bbc.co.uk/history/ww2peopleswar/stories/70/a4127...Colditz I think they repurposed a car alternator as a static-bicycle generator. They had a lot of space inside a stone structure to hide things.