.
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
Ancient Greek Technology: The History and Legacy of the Technological Advances Made in Greece during Antiquity Paperback – March 4, 2019 ,Charles River Editors (Author)
Greek and Roman Technology: A Sourcebook of Translated Greek and Roman Texts (Routledge Sourcebooks for the Ancient World) 2nd Edition, by Andrew N. Sherwood (Author), Milorad Nikolic (Author), John W. Humphrey (Author), John P. Oleson (Author)
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