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Four mast crane (scaffold). Photo : Augusta Stylianou Artist

It was constituted by four vertical joists that were linked with horizontal across or cross located joists and sidelong security beams "antirides".
The load was suspended via hoist "polyspasto" from the inside of the machine. With the combination of many four-mast cranes, the "scaffolds" were created, that had on their vertex (on rollers) manually operated winches for load elevation.

Sources
Vitruvius, On Architecture
Heron of Alexandria, Mechanics,
Pappos of Alexandria, Mechanics

Four mast crane (scaffold). Photo : Augusta Stylianou Artist

Four mast crane (scaffold). Photo : Augusta Stylianou Artist

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