7 Terms
Home > Industry/Domain > Chronometry > Clock
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
Add a new termContributors in Clock
Clock
Silvering
Chronometry; Clock
A process for forming a slightly matt or frosted finish of chemically deposited silver on brass or copper clock dials, chapter rings, etc. To silver a dial with the engraved numerals already filled ...
Silent escapement
Chronometry; Clock
Clocks for use in bedrooms are required to produce as little noise as possible. To this end various escapements fitted with resilient pallets have been made. In a verge bracket clock fitted with gut ...
Sidewalk clock
Chronometry; Clock
Post or sidewalk clocks were first commercially produced in the United States c. 1870. The clocks were available in two- or four-dial models from 30 in. To 40 in. In diameter, supported on decorative ...
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 relative to the ...
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 or lacquer, and in ...
Tidal dial
Chronometry; Clock
A fine example of the clockmaker's ingenuity. Two sets of Roman numerals, from one to twelve, were engraved, usually in the dial arch alongside the 29 1/2 days of the moon's phase. By adjusting an ...
Tic-tac escapement
Chronometry; Clock
A form of anchor escapement in which the anchor only spans one to three teeth of the escape wheel. It is fitted to French drum clocks with short pendulums swinging through a large arc. Sometimes one ...
