Model of a screw-propeller lifting gear Model of a Lifting Screw, Model of a screw sleeve between stern and rudder, with part of the keel. The screw light device consists of a loose frame with a normal two-blade screw, which can be lifted up and down in the tube by a rope that runs over two discs at the top of the screw tube and two discs in the screw window. The screw is connected to the screw shaft in a slot, the screw can be disconnected with the slot in the vertical position. The screw frame moves over vertical rails against the stern and the stern, which are provided with teeth, this includes catches of the screw window that prevent slipping back. The catches can be held back by pulling on two ropes, so that the screw window can be lowered. The aim to prevent the screw from turning when hoisting is mounted in the screw window and is controlled from above by a long socket wrench. The model is very detailed and can be taken apart, so that the composition of the liner, the propeller shaft etc. can be viewed., H. Huijgens, 1853 - 1856, wood (plant material), brass (alloy), rope, h 80.5 cm × w 60.2 cm × d 25.8 cm
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