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Horology M
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| Main Plate |
Essentially, the chassis of the watch; the base plate
on which all the other parts of a watch movement are mounted. |
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| Mainspring |
A watch's power supply, coiled up inside the barrel.
When unwound, a common mainspring is about 9 to 13 inches. The longer
the mainspring, the longer the power reserve. |
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| Manual wind |
A movement is wound by hand through the crown. |
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| Mechanical Watch |
A watch that runs from the energy released by its spring
rather than electricity. |
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| Meridian |
The line of longitude that passes through the observer's
location or its representation on the sundial. Time meridian means
the line of longitude which defines the time zone of any area. |
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| Microrotor |
An automatic watch with a small, decentralized rotor,
typically recessed within the movement for extra thinness. |
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| Military Time |
A format of time based on 24 hour, e.g. 5:00 p.m. in
Military Time format is 17:00 |
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| Mineral Crystal |
A watch crystal made of mineral glass, which is cheaper and less
durable than synthetic sapphire.
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| Minute Repeater |
A watch that strikes the time on command using different
dings and dongs for hours and minutes: There is one tone for each
hour, a double tone for each quarter hour, and another higher or lower
tone for each minute; for example, Ding Ding Ding, Ding Dong, Dong
Dong Dong Dong indicates that the time is 3: 19). Invented by Englishman
Daniel Quare in 1690, it was an important device before watches could
be read in the dark. Now it becomes a demonstration of watchmaking
artistry and craftsmanship. |
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| Module |
A complication that can be attached to a base movement as a complete
unit.
Chronographs, Perpetual Calendars, Astronomical Displays, and Repeaters
can all be modular in design.
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| Monopusher |
A chronograph with only 1 pusher for the start, stop,
and reset functions. |
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| Moon Phase
Indicator |
A watch complication that displays the phases of the
moon either through an aperture or, less commonly, with a small hand. |
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| Movement |
The heart of a watch or a clock. It consists of the
winding mechanism, the mainspring, the train, the escapement, and
the regulating elements. |
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| Movement blank |
Refer to Ébauche |
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| NIB |
Abbreviation of " New In Box " |
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| Nivarox |
A trade name for a hairspring alloy with superior temperature
compensating properties, available in varying grades: I, II, etc. |
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| NOS |
Abbreviation of " New Old Stock ", An old
watch which has never been used, or even sold. |
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