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Chronometry
The science of the measurement of time.
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Chronometry > Clock 
sidereal time
Chronometry; Clock
The sidereal day is the time of one complete revolution of the Earth relative to the first point of Aries, or the spring equinox. This is not quite the same time as one revolution ...
shellac
Chronometry; Clock
A resinous substance produced as a protective coating by the lac insect of India. It is available as amall orange flakes which are dissolved in methylated spirit to form a varnish ...
sheep's-head clock
Chronometry; Clock
A type of lantern clock in which the chapter ring protrudes a considerable distance beyond the normal lantern-clock frame. Although the sheep's-head clock first appeared c. 1700, ...
shears
Chronometry; Clock
Hand shears or snips are used for cutting thin sheet metal. They may be curved or straight, curved ones for cutting small inside curves and straight ones for making straight or ...
touch pieces
Chronometry; Clock
Small knobs or points found on medieval and early Renaissance single-handed clocks, for feeling the time in the dark. They were used for weight-driven clock dials and on ...
torsion pendulum
Chronometry; Clock
A form of balance suspended by a thin narrow metal strip. As the balance rotates, the suspension strip is twisted, moving an arm situated near the upper end of the suspension. The ...
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