a man, weighted down with ballast, climbs up a ladder. at the top, he places his feet in stirrups that are connected to a rope that runs over a winch and is anchored to a pile-driver. the pile-driver lying on the ground is raised upward when the man jumps downward. once on the ground, the man climbs out of the stirrups and the pile-driver rushes down and strikes a pile planted in the ground. this procedure can be repeated at will. the force of the impact can be increased by using a heavier pile-driver and correspondingly more men in the procedure.
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leonardo da vinci - der codex leicester: Wasser, Erde, Mond und Bewegung
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