Composed of three large crossbows. Uses tension to launch arrows, pyrotechnic projectiles, and balls of rock, lead, and iron to defend a city or fortress.
Mechanics: hand crank; spur gear and lantern.
Ramelli, Agostino. “Plate 193: Ballista.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/dr26xx63g.
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