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STEPHENSON LINK EXPLAINED JHA 01-06-11.MOV

This short video explains how the Stephenson Link works on a steam engine to give reverse, forward, neutral and anything in between. It operates by changing the phase relationship between the engine's valve and the piston. It can be operated on-the-fly which is one of its chief advantages to the engine man. This valve gear scheme or linkage was invented by George Stephenson in the year 1800. The term "valve gear" as applied to steam engines means valve mechanism or valve linkage. There was absolutely nothing else like his linkage at the time. It was very novel and was an instant success.

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