Can be operated by a single person, easily and with little noise. The device depicted here is also illustrated on Plate 157.
Ramelli, Agostino. “Plate 158: Screw-Jack for Breaking the Iron Gratings of a Portcullis.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/9019s269z.
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