Model of a Lifting Screw, Nederlandsche Stoomboot Maatschappij Fijenoord, c. 1857 Canvas Print
Model of a screw shaft between stern and rudder stems, with part of the keel and the rear apostles. The screwlighter consists of a separate frame with a screw, which can be hoisted up and down in the tube on a rope, which runs over a disc at the top of the screw sleeve and a disc in the screw frame. The screw is a Mangin screw, a four-bladed propellor, composed of two two two-bladed screws that can be put in parallel position for lighting. The propeller is disconnected by pulling the shaft into the ship. The vertical rails against the stern and the screw stems over which the screw window moves are provided with teeth; this includes ratchets of the screw window that prevent slipping back. The ratchets can be held back so that the screw window can sink. Beams against the stevens keep the screw window down and should be removed before lighting. Scale 1:10 (estimate).
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