20 Terms
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Clock
Any instrument other than a watch for measuring or indicating time, especially a mechanical or electronic device having a numbered dial and moving hands or a digital display.
Industry: Chronometry
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Clock
Lut line
Chronometry; Clock
The strong thin cord used to hang a clock weight or to connect the mainspring to the fusee in lower-quality fusee clocks, good fusee clocks having chains. The best gut clock lines were made from ...
Lunar dial
Chronometry; Clock
An additional dial on a clock face that indicates the phase of the Moon each day. See also Moon Dial.
Lunar cycle
Chronometry; Clock
A cycle of 19 years after which the phases of the moon recur on very nearly the same days of the year; also known as the 'Metonic cycle', from its discoverer, in 432 BC, the Athenian astronomer ...
Looking-glass clock
Chronometry; Clock
A clock with a box-like case and mirror instead of a painted-glass tablet.
Mercury pendulum
Chronometry; Clock
In American clocks, a silvery-looking, usually cylindrical pendulum designed to simulate French examples, which actually contained mercury.
Mercurial pendulum
Chronometry; Clock
George Graham, with his mercurial compensation pendulum, preceded John Harrison by a few years in solving the problem of temperature error caused by the expansion or contraction of the pendulum rod ...
