Gastraphetes
Gastraphetes is ancient greek type of crossbow. It is invented by engineer Ctesibius (285-222 BC). It was powered by composite bow and cocked by resting the stomach in a concavity on the rear of the stock and presing down. Gastraphetes is described by Heron of Alexandria in 1st century AD in his work Belopoeica (On arrow-making). Heron described gastraphetes in details so it can be reconstructed using only his work.
A larger version of gastraphetes is oxybeles, it was a siege weapon.
Polybolos
Ancient Greeks also used huge repeating crossbow called polybolos. Polybolos is invented by Dionysius of Alexandria in 3rd century BC. This crossbow shoot 4 bolts in a minute. It could be reloaded by one man.
Gastraphetes:
Polybolos:
Gastraphetes:
Oxybeles:
Polybolos:
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