Treadwheel crane
A treadwheel crane (Latin: magna rota) is a wooden, human-powered hoisting and lowering device. It was primarily used during the Roman period and the Middle Ages in the building of castles and cathedrals.
A treadwheel crane (Latin: magna rota) is a wooden, human-powered hoisting and lowering device. It was primarily used during the Roman period and the Middle Ages in the building of castles and cathedrals.
A treadwheel crane (Latin: magna rota) is a wooden, human-powered hoisting and lowering device. It was primarily used during the Roman period and the Middle Ages in the building of castles and cathedrals.
Source: Wikipedia "Treadwheel crane" · CC BY-SA 4.0
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