dead centre

noun

the exact top ( top dead centre ) or bottom ( bottom dead centre ) of the piston stroke in a reciprocating engine or pump
a pointed rod mounted in the tailstock of a lathe to support a workpiece

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It is opening of the port at either end of the steam cylinder allowed by the valve when the engine is on a dead centre.

An old engineer5 gives the following directions for finding the dead centre accurately.

Turn the engine over and proceed in the same way to find the other dead centre.

At a late hour that afternoon the war council of the incorporators of Linda Lee Inc. stalled on dead centre.

In order to set a valve the engine must be brought to a dead centre.

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