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What is Perpetual Motion?
Elementary Physics and Perpetual Motion
Medieval Perpetual Motion
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able allowed appeared arms arranged attempts ball become believed bottom built called carried cause centre century claims clock considered construction contained continue demonstrated descending described device discovered driving early effect electricity energy engine examination exhibition existence experiment fact fall flow force four friction give gravity half heat idea impossible inclined increased interesting invention inventor Keely keep lamp less liquid magnets manner material means mechanism motor move Museum named natural once operation passed patent perpetual motion machine petual piece pile placed plane possible practical present pressure principle probably produced Professor proved published reason reference remained rotation scheme screw seems seen shaft side similar simple spring strange supported thing thought tion tube turn weights wheel whole winding