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Subject Ballista Remove constraint Subject: Ballista

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    • 1588

    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.

    • 1588

    Uses tension to launch arrows, pyrotechnic projectiles, balls, and rocks to defend a city or fortress.

    Mechanics: roller thrust bearing; projectile throwing engine; trigger.