Watchman's clock

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a watchman's detector in which the apparatus for recording the times of visiting several stations is contained within a single clock.

See also: Watchman

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Boats aside, he has his own rather more humble treasure at home - a watchman's clock made by his great-great grandfather's patent name, which had been sold to the Pennsylvania State Railway.
Detex Corporation of New Braunfels, Texas, has introduced a new mechanical watchman's clock that is lighter and less expensive than other similar products and needs no winding.