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Back-lash.

The reaction or striking back of a piece of machinery, wheel, piston, etc., when the power makes a temporary pause, or a change of motion occurs. It is a consequence of bad fitting or wear, and, in the latter case, indicates that the parts should be set up. The gib, cotter, and strap of the pitman connection are an instance of provision for said readjustment.

In some cases springs are arranged to keep the parts in positive contact, so that no reflex motion occurs, to be taken up suddenly when the power is again applied.

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