How an old miner's lamp works.
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Previously:
https://www.homemadetools.net/forum/...295#post131030
https://www.homemadetools.net/forum/...730#post163389
https://www.homemadetools.net/forum/...962#post140730
https://www.homemadetools.net/forum/...896#post133574
https://www.homemadetools.net/forum/...734#post139991
https://www.homemadetools.net/forum/...573#post128222