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More model informationAn onager is a type of catapult that has one arm and uses torsion for hurling the projectile. Large onagers were used as siege engines and could launch huge projectiles to be used to smash through walls and fortifications. It could also be loaded with many smaller stones or fiery pitch to use against enemy troops or to bombard the inside of a fortress. The onager was invented around 250 B.C. The first mention of a one-arm torsion catapult is by Philon of Byzantium in his book, Mechanike Syntaxis (Compendium of Mechanics) and he lived from 280 B.C. to 220 B.C. It is referred to in one section, called Belopoeica (Artillery). The reference can be found in Greek and Roman Artillery: Technical Treatises by author E.W. Marsden.
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