TY - CHAP DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: Public Domain Mark 1.0 TI - Plate 163: Screw-jack for breaking the bolt off a door T2 - Le diverse et artificiose machine del capitano Agostino Ramelli ID - 2n49t198r AU - Ramelli, Agostino CY - Paris, France DA - 1588/// YR - 1588 UR - https://digital.sciencehistory.org/works/2n49t198r AB - 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. KW - Jackscrews KW - Machinery LA - ER -