escapement error

American  

noun

Horology.

1. loss of isochronism in the movement of a pendulum as a result of its relation to the escapement.

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Example Sentences

It is unfortunately impossible so to arrange the pallets that the circular error may be thus exactly neutralized, because the escapement error depends, in a manner reducible to no law, upon variations in friction of the pallets themselves and of the clock train, which produce different effects; and the result is that it is impossible to obtain very accurate time-keeping from any clock of this construction.

From Project Gutenberg