A crane of two-sided elevation

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A crane of two-sided elevation


It consisted of a moving (on wooden rollers) platform and a vertical frame in the shape of “Π” that had a hoist ("polispasto") on its top and a radiated winch for the elevation of the load on its base. On the two sides of the platform there were winches to control the frame inclination. It was suitable for loading or unloading ships but also for the construction of piers as it is described by the excavation team of Jean- Yves Empereour at the Cyprus Amathous port. The stone was tightened (from the "U" shaped handles at both sides) at the back side of the platform, then it was raised using the central winch and then moved to the front side of the platform using a combination of pulling and loosening on the front side and back side winch correspondingly. Then the stone was brought down using the central winch (and since it could be rotated) it was positioned inside the sea. The platform moved constantly lengthwise on the built piers.

SOURCES: "Vitrouvius, On architecture X", "Heron of Alexandria, Mechanics", "Pappos of Alexandria, Mechanics", "Tony Kozelj, Manuela. Wurd- Kozelj, Jean-Yves Empereour, Elevating mechanism for stone transport in Amathus port"