For launching rocks and fireballs to defend a city or fortress.
Mechanics: hand crank; worm and worm gear; spur gear and recessed face gear; projectile throwing engine.
Ramelli, Agostino. “Plate 191: Moveable Counterweight Trebuchet.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/h702q667h.
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