Treadwheel crane
Wooden, human powered, hoisting and lowering device
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. The often heavy charge is lifted as the individual inside the treadwheel crane walks.
Read on Wikipedia · Image Marie Reed, Public domain
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