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sub-seconds hand - A smaller sub-dial on the main dial displaying constant seconds.
split-second chronograph - The feature or complication of a watch which allows you to measure fractions of a second and elapsed time by two separate recording hands, independently of the watch displaying normal time.
sweep seconds hand - A seconds hand mounted in the center of the dial displaying constant seconds.
Solar Day - The actual time the earth takes to rotate once a day with the use of the sun as a fixed point of reference. The measurement interval of time is taken between two successive transits of the sun over the same meridian.
dial - The part of a timepiece which allows you to read the time or observe other functions the timepiece may perform. Also known as the face.
anti-magnetic - A watch that is resistant to magnetism. A term used to describe the use of non-magnetic materials used in the parts
of a watch most affected by magnetization (balance wheel, balance spring and escapement).
Sidereal Day - Actual time the earth takes to rotate once a day with the use of a fixed star as a reference point. The measurement interval of time is taken between two successive transits of the same star over the same meridian. A Sidereal Day is 3 hours and 56 seconds longer than the mean time of a solar day.
hack movement - A style of movement normally fitted with a sweep center seconds hand, where the balance assembly is stopped when the watch is placed in the setting position. This allows the time to be set more accurately.
tritium - A substance applied to hands and hour markers to make them luminous so they will glow in the dark.
musical watch - A watch made with a mechanism like a music box that plays a melody on each hour automatically, or on demand with a slide or button.
square - Style of watch case in which each of the four sides are equal size.
push button - External button on outside edge of case. Used to start or stop specific functions or complications of the watch, such as chronographs and alarms.
gold-plated - A coating of a gold alloy over a base metal by either electro-depositing and/or a chemical process. Recommended minimum thickness should be 10 microns thick.
chronometer escapement - A high-grade escapement invented in the late 1700s for use in larger style mechanisms (marine or box chronometers) on ships to determine longitude. The most famous type of chronometer escapement is the "detent" style.
tachometer - Watch or stop watch used for the measurement of speed. Normally a timer or chronograph with a graduated dial or bezel allowing the speed of a vehicle to be figured in miles per hour or kilometers per hour.
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C - E |
F - L |
M - Q |
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T - Z
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