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The gastraphetes (from Ancient Greek γαστραφέτης, English translation: "belly-releaser") was a hand-held crossbow used by the Ancient Greeks.〔; ; ; ; 〕 It was described in the 1st century AD by the Greek author Heron of Alexandria in his work ''Belopoeica'', which draws on an earlier account of the famous Greek engineer Ctesibius (fl. 285–222 BC). Heron identifies the gastraphetes as the forerunner of the later catapult, which places its invention some unknown time prior to c. 420 BC.〔; 〕 Unlike later Roman and medieval crossbows, spanning the weapon was not done by pulling up the string, but by pushing down an elaborate slider mechanism. == Description == A fairly detailed description and drawing of the gastraphetes appears in Heron's ''Belopoeica'' (Ancient Greek Βελοποιικά, English translation: ''On arrow-making''), drawn from the account by the 3rd-century BC engineer Ctesibius. The weapon was powered by a composite bow. It was cocked by resting the stomach in a concavity at the rear of the stock and pressing down with all strength. In this way considerably more energy can be summoned up than by using only one arm of the archer as in the hand-bow. There are no attestations through pictures or archaeological finds, but the description by Heron is detailed enough to have allowed modern reconstructions to be made. According to some authors, the dimensions of the gastraphetes may have involved some kind of prop. A larger version of the gastraphetes were the oxybeles, which were used in siege warfare. These were later supplanted by the early ballistae that later also developed into smaller versions supplanting also the gastraphetes. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gastraphetes」の詳細全文を読む スポンサード リンク
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