Millstone can be raised or lowered by wedges.
Mechanics: horse whim; spur gear and lantern; lantern and crown gear.
Ramelli, Agostino. “Plate 122: Grain Mill Powered by Horse.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/rn3011542.
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