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Horology A ~ Z

Horology A
Adjusted The process by which the rate of the watch is aligned to be as close as possible in different physical positions, as well as in different states of winding (for example, fully wound Vs after 24 hours running) and in different temperatures. A fully adjusted watch is typically one that is adjusted for 5 positions (crown down, crown left, crown up, dial up, and dial down), uniform in time, and temperature (both heat and cold), for a total of 8 adjustments.
Alarm Timer A timer to disable the alarm at a predetermined time in order to avoid false alarms.
Alarm Watch A watch with a built in bell or buzzer that can be set to ring at a specific time.
Amplitude The maximum angular displacement of the balance wheel from its resting position measured in degrees. Often used as an indicator of a watch movement's running health.
Analog Display There are 2 kinds of time displays: One is called analog, which is the standard dial formation with hands (generally hour, minute, and second); the other kind of display is called digital, and it displays the time as a readout, i.e., 10 : 38. The LCD or LED is used in digital displays, although some mechanical watches have digital displays using discs that can be seen through apertures.
Annual Calendar A calendar mechanism that automatically adjusts itself for the long and short months of the year (with the exception of February). More complicated than a simple calendar (which must be adjusted for all months of fewer than 31 days), less complicated than a perpetual calendar.

Antimagnetic watch
A watch with features incorporated into the movement or, more commonly, the case that protects it from disturbances caused by magnetism.
Anti-reflective coating A thin metallic coating applied to the crystal in order to eliminate glare; usually applied to the inside of the crystal but sometimes to both sides.
Aperture An opening on a dial through which can be seen displays such as the date, day, month, or moon phase.
Applied Numerals Raised metal characters attached to the dial.
Applique Numerals or symbols that are adhered to a dial.
Arabic Numbers 0 ~ 9, Originated in India and introduced by the Arabs to Europe in about the 10th century AD.
Arbor A rotating post (or axle) in a watch movement. Typically the central portion of a wheel (containing the pinion) or the central attachment point of the mainspring; the barrel arbor.
Assortiment French term for the parts used for making an escapement.
ATM Refers to a watch's water-pressure rating. ATM is short for atmosphere and 1 ATM is roughly the equivalent of 10 meters of depth.
Automatic Watch A self-winding watch; a watch that does not have to be wound manually. It winds itself by the action of the watch on the wearer's wrist, typically through a semicircular rotor inside the watchcase that winds the mainspring The rotor winds either in just one direction or two directions.
Automation An animated component or character on a watch that performs some action on command, typically associated with a minute repeater or other striking complication, and often depicting erotic scenes. Also known as a jacquemart.
Auxiliary Dial A small dial showing seconds only, up to 1 minute, usually at the 6 o'clock position.

Aviator's Watch
Traditionally, a big watch with an oversized dial and luminous numbers and hands; aircraft navigators wore this type of watch with long leather straps over the sleeve, i.e., the watch was worn outside the fight jacket.

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