Uses tension to launch arrows, pyrotechnic projectiles, balls, and rocks to defend a city or fortress.
Mechanics: roller thrust bearing; projectile throwing engine; trigger.
Ramelli, Agostino. “Plate 192: Ballista.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/js956g141.
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