Model of a Lifting Screw, Petrus van der Loo, 1857 demonstration model Model of a screw cooker between rear stern and stirring, with a part of the keel and the rear postles. The screw light device consists of a loose frame with a screw that can be hoisted up and down in the tube on a rope, which runs over a disc at the top of the screw cooker and a disc in the screw window. The screw is a Mangin screw, a four-leaf propellor, composed of two two-blade screws that can be put in parallel position for lighting. For this, the axis of the rear screw, which runs through the axis of the front, is prov

Model of a Lifting Screw, Petrus van der Loo, 1857 demonstration model Model of a screw cooker between rear stern and stirring, with a part of the keel and the rear postles. The screw light device consists of a loose frame with a screw that can be hoisted up and down in the tube on a rope, which runs over a disc at the top of the screw cooker and a disc in the screw window. The screw is a Mangin screw, a four-leaf propellor, composed of two two-blade screws that can be put in parallel position for lighting. For this, the axis of the rear screw, which runs through the axis of the front, is provided at the back with a slot, which must be put in a vertical position to be able to light the screw; The rails on which the slot runs immediately blocks the screw in vertical position. The front screw is then in horizontal position. Of these, the propeller shaft at the front has two crossing slots, which fit the same rail: halfway, between lines A and B, this rail is interrupted, so that the screw can be turned here. The vertical rails against the stern and the screw stitch over which the screw window moves are provided with teeth; This includes piles of the screw window that prevent the slip. The piles can be retained by pulling two ropes, so that the screw window can sink. Scale 1:10 (derived). Netherlands wood (plant material). rope

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