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What would happen if you add an LED either above or below the battery, before connection to the copper wire? Would it give you a flickering light?
A most extraordinary device. I may have to try to make one. It doesn't seem as if it should work if you have a constant current. Is it possible that you briefly loose contact as the wire spins? What would happen if you add an LED either above or below the battery, before connection to the copper wire? Would it give you a flickering light?