Heron's one-mast crane

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Heron's one-mast crane

It was constituted by only one large joist that had two "pulley-wheels" at its vertex and at the base. Its inclination was achieved with the help of three balancing ropes that were tautened or loosened with the help of small winches. A rope was coiled around the mast at equal distances. The strength of the mast was increased and the winding rope on it was used to climb to the top of the mast, if required.

The joist was usually located on a base with rollers for its horizontal shifting with a dent in the centre that ensured its articulation. The traction force of the rope for the elevation of the load was emanated by animals or by a powerful manually operated ground winch. It was used for the rapid implementation of minor work.

SOURCES: "Heron of Alexandria, Mechanics", "Pappos of Alexandria, Mechanics"