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

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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References in periodicals archive ?
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.
"He emigrated in the early part of the 19th century from the Black Forest in Germany to America and he and his brother, who remained in Germany, patented this watchman's clock - a big brass thing that watchmen would take on their rounds," says Buerk.
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.