Model of a Lifting Screw, Rijkswerf Vlissingen, 1857 Canvas Print
Model of a screw sleeve in a stern with elliptical stern. The screwlighter consists of a separate frame with a two-blade screw, which can be hoisted up and down in the tube on a rope, which runs over two discs at the top of the screw sleeve and two discs in the screw frame. The propeller shaft has a hexagonal end that fits into the screw. The propeller is disconnected by withdrawing the shaft into the ship, for which a lever mechanism driven by a gear with unscrewed propeller is fitted into the ship; the shaft can be shortened by a telescopic part behind the cogwheel. The screw window moves over vertical rails against the stern and the screw stems, which are provided with teeth; this includes ratchets of the screw window that prevent slipping back. The ratchets can be held back by pulling two ropes, so that the screw window can sink. A beam placed against the screw stems and clamped with bolts blocks the movement of the screw window when lowered. The mik that prevents the screw from turning when hoeding is mounted in the screw window and is operated from above by a long auger-like cap wrench. The model is detailed down to the last detail as lubrication points and shows the ship's construction. The screw with its spherical hub resembles a screw of Griffiths with changing pitch, but the blades are fixed. The propeller shaft is driven with a crank. Scale 1:10 (derived).
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