The machine is braced against the chest. Can be operated by a single person, easily and with little noise.
Mechanics: hand crank; worm and worm gear.
Ramelli, Agostino. “Plate 163: Screw-Jack for Breaking the Bolt off a Door.” In Le Diverse Et Artificiose Machine Del Capitano Agostino Ramelli. Paris, France, 1588. https://digital.sciencehistory.org/works/2n49t198r.
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