back pressure

noun

engineering
1. the pressure that opposes the motion of a piston on its exhaust stroke in an internal-combustion engine
2. the exhaust pressure in external combustion engines
med the local pressure that builds up when fluid flow is obstructed in the cardiovascular or urinary systems

So in using steam expansively the back pressure must be at a minimum, and this is especially true in the compound engine.

In using steam expansively the relative proportion between the back pressure and the force of the steam is of course greater.

This cannot be carried very far, however, for the back pressure of cushion will reduce the energy of the engine movement.

The back pressure saved will at once show in the pulling power of the engine, and every one will be surprised.

Another thing, the smallness of the exhaust nozzle in the smokestack affects the back pressure.

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