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The treadwheel crane (6th c. B.C.)

It was used for lifting heavy loads and its “mast” consisted of two giant 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 which were tautened by block and tackles and winches. The load was lifted or lowered with the help of two lifting ropes, the “trispaston” pulley with double “pulley-wheels” in each little axial rod and the horizontal axle was placed on the “tortoise-like cases” which were rotated by the weight of one or more men who walked inside the incorporated radial treadmill (rotating “cage”). The ropes were wrapped at the ends of the “reel” at both sides of the cage.