![]() ![]() Photo: This radio doesn't need batteries because it's powered by a simple hand-crank: when you crank the handle, you spin a small electricity generator (dynamo) inside the case that stores energy in rechargeable batteries.Īlthough you're turning the crank, if you do it for a while you soon get a distinct feeling that you're moving your handīack and forth instead of round-and-round. Cranks and cams are just as useful today and you can find them in everything from car engines and bicycle pedals toĪnd sewing machines. ![]() They're cunning inventions that convert the push-pull motion of engines and machines into the spinning and whirring motion of wheels-or vice-versa. What sort of problems keep you awake at night? If you'd been an engineerĭuring the Industrial Revolution, tinkering with steam engines and such,Ĭams and cranks were the kind of thing you'd have worriedĪbout. ![]()
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