18 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
equinoxes
Chronometry; Clock
The dates, spring and autumn, at which day and night are of equal length, or, more precisely, the dates at which the sun's declination is zero. On celestial or armillary spheres the equinoxes are the ...
equinoctial (or equatorial) sundial
Chronometry; Clock
A sundial with its hour scales on a circle parallel to the Earth's equator. Since the great circle in which this plane meets the interior of a celestial sphere was termed by medieval astronomers the ...
equatorium
Chronometry; Clock
A hand-operated mechanical instrument in the form of an elaborate volvelle by which the positions of the planets in the heavens can be found.
equation table
Chronometry; Clock
A table giving the values of the equation of time throughout the year. Equation tables were often pasted inside the doors of longcase clocks during the late 17th and early 18th centuries.
equation of time
Chronometry; Clock
The difference between apparent solar time, i.e. The time shown by a clock running uniformly throughout the year. The difference arises from two factors in the Earth's orbital motion around the sun ...
equation dial
Chronometry; Clock
A rare form of auxiliary dial which indicates the difference between solar and mean or average time. Most early long case clocks were sold together with a sundial which was an essential adjunct to ...
equation clock
Chronometry; Clock
The challenge of devising a clock which recorded solar as well as Greenwich mean time occupied the great makers of the golden age of English clockmaking, men like Thomas Tompion and Daniel Quare. ...
