EXHIBITS > The elevating mechanisms of the ancient Greeks >
Crane of human rotating ''cage''
It was used for the elevation of large loads and its mast was constituted by two gigantic pieces of wood in the form of Λ. Its articulation was ensured by two dents in the ground. Its stabilisation in various inclinations was achieved by two balancing ropes that were tautened by hoists and winches.The load was raised or lowered with the help of two traction ropes, the hoist "trispaston" with double "pulley-wheels" in each little axial rod and the horizontal axle was placed on the "tortoise-like cases" that were rotated by the weight of one or more men that walked inside the incorporated radial treadmill (rotating “cage"). The ropes were wrapped at the ends of the “reel” at both sides of the cage.
SOURCES: "Vitrouvius, On architecture X"