Model of a Disengaging Gear for Paddle Wheels, D. van den Bosch, 1842 demonstration model Model of the disconnection of the crankshaft of a scoop wheel, on a ground board. Crankshaft and Rader axis are connected by a connecting piece, a so-called tug or rotation, which allows some impurity in the alignment of the axes. The tug can be taken apart and the piece on the Rader axis turned a quarter turn, so that stools are released and the stool with the stool pen can turn unhindered. A loose tug is attached separately. Scale 1:10 (derived). Netherlands wood (plant material). brass (alloy). paint (coating)