Chronometer: Precision Instrument Which Registers Sharp Impacts By Displaying A Telltale Spiderweb Pattern On Its Glass Face

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Chronometer: Precision instrument which registers sharp impacts by displaying
a telltale spiderweb pattern on its glass face, by the absence of
a normal ticking sound when held to the ear, or by the presence
of small, loose pieces moving around within its case when shaken.
It also indicates excess humidity by forming tiny droplets on the
inside of its face, and when stopped, it displays the correct time
twice each day.
-- from "Sailing" by Henry Beard and Roy Mckie

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