The greeks continued to improve their catapult designs. In addition to simply flexing and bending a rod in order to produce force, they added more energy.
They also began to use springs made of large ropes of animal hair. The soldiers pulled back on the handle, and the "hair spring" became twisted, strong up energy. when the spring was released, the catapult shot rocks, arrows, or burning tar onto enemies.
Where you get these snaps really nice and useful!
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