Model of An Oscillating Steam Engine With Adjustable Steam Valve, Royal Factory P. van Vlissingen & Dudok van Heel, 1855 instruction model Moving sketch model on ground board. The model, which is driven with a crank, shows the following parts: diameter of an oscillating cylinder with piston, which drives a crankshaft; Scissors movement of Stephenson on the crankshaft, which drives the Driepoort steam slide; steam slide controller. The latter consists of a screw-without-end with a crank, with which a gear quadrant can be moved, which with a rod controls the transfer of the scissor movement on the steam slide. With this controller, the machine can be put in front and backwards. Amsterdam wood (plant material). brass (alloy). paint (coating)