Watt Beam Engine

This illustration shows the general arrangement of a typical beam engine.  Beam engines were used in many factories to drive machinery of all types and were sometimes built to enormous proportions.  I have omitted the valve gear, as it was substantially the same as the locomotive engine.

It was important to restrict the motion of the piston and rod to a straight line in order to reduce friction and wear on the upper cylinder seal. The Watt linkage illustrated here is one of many contrivances for accomplishing this linear motion.

Copyright 2000, Matt Keveney. All rights reserved.


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