It's all done with gears. Also pinions, snails, arbors; pawls and ratchets; and cam followers; cables, levers, bell cranks, and pivots.
A patron of cranks ...[throughout his work runs] the feeling that no matter how honest scientists think they are, they are still influenced by various unconscious assumptions that prevent them from attaining true objectivity. Expressed in a sentence, Fort's principle goes something like this: People with a psychological need to believe in marvels are no more prejudiced and gullible than people with a psychological need not to believe in marvels.charles fort
I am discounting reports of UFOs. Why would they appear only to cranks and weirdos?stephen hawking