EXHIBITS > The elevating mechanisms of the ancient Greeks >
They were constituted by the combination of a constant and independent "pulley" in a interdependent system via the elevation rope. In the wooden or metal sheath of each "pulley" one or more axles were fitted and around each one rotated one or more pulley-wheels. "Trispasto" was the system with three reels (two in the above "pulley" and one in the below). "Tetraspasto" was the system with four reels (two in each "pulley"),etc.
SOURCES: "Vitrouvios, On architecture X, 1-2", "Heron of Alexandria, Mechanics", "Pappos of Alexandria, Mechanics"