EXHIBITS > The siege technology of the ancient Greeks >
The stone-throwing catapult of Isidoros of Abydos
It was launcher of small stones. The case ("syrinx") was framed by two oblong boards which internally had iron ratchets. The sliding central beam ("slider") was cocked with the help of ropes and a powerful manually-operated winch and secured in the prongs of the ratchets. The slider, after the launch, moved forwards again (so as to accept the bow-string) with the help of a small rotating axle (with handspikes). The string was divided into two parts that were linked with a leather sling and a metal ring that constituted the reception for the claw. The catapult was roughly 4 m long and it launched spherical missiles of 20 - 25 cm in diameter and weighing15 - 20 kg.
SOURCES: "Biton, Construction of War Machines and Artillery"