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Horology T
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Tachymeter
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Tachometer |
A device used on a chronograph for calculating speed
over a measured distance or the hourly productivity of any event that
takes less than one minute. |
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| Tang Buckle |
The traditional strap attachment involving a pin (called
a tang) and buckle. |
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| Tantalum |
Tantalum is a chemical element with the symbol Ta and atomic number
73. A rare, hard, blue-gray, lustrous transition metal, tantalum
is highly corrosion resistant and occurs naturally in the mineral
tantalite.
It is used to make a variety of strong alloys with very high melting
points, sometimes used in its pure form for watchcases. Because
it is not affected by sweat and other body secretions, it is non-irritating.
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| Telemeter |
A chronograph scale for measuring distance based on
the time it takes the sound to reach the observer. |
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| Terminage |
French term denoting the process of assembling watch
parts for the account of a producer. |
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| 3 - piece case |
A traditional watchcase consisting of a case middle,
bezel, and back. |
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| 3 - quarter plate |
A movement construction common to English, American and German watches
in which the gear train is held under a single large plate, instead
of separate bars or bridges. Only the balance wheel and escapement
are exposed to view. |
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| Time Lock |
Time lock is one kind of combination lock which use
a clock mechanism to secure a safe. |
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| Time-only Watch |
A watch that tells the time without any complications,
such as a chronograph or a date watch. |
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| Titanium |
Titanium is a chemical element with the symbol Ti and atomic number
22. Sometimes called the “space age metal”, it has a low density
and is a strong, lustrous, corrosion-resistant (including to sea
water, aqua regia and chlorine) transition metal with a silver color.
It is stronger and lighter than stainless steel and is an increasingly
popular choice for cases and bracelets.
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| Tonneau |
A watchcase which is shaped like a barrel. |
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| Tourbillon |
Invented by Abraham Louis Breguet in 1801, it is a rotating
cage within the watch that contains the balance, hairspring, and escapement.
Traditionally it rotates once every minute (although versions with
different time frames are not uncommon) and is designed to eliminate
positional errors in the vertical positions. As it rotates, it exposes
each positional error for the same amount of time, thus averaging
them out. |
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| Train |
A series of wheels in a watch or a clock; the power
train or gear train. |
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| Tricompax |
A chronograph with 3 sub-dials at 3, 6, and 9 o'clock. |
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| Triple Calendar |
A dial displaying the day, date, and month. |
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| Tritium |
A slightly radioactive substance used to make hands
or hour markers glow in the dark. |
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| Tuning Fork |
A transistor continually switching between 2 small magnets to regulate
smooth running, oscillation 360 times a second. The high frequency
gives great precision in time-keeping.
Bulova Accutron made the use of the device famous, but then quartz
watches usurped its popularity.
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| Two Tone |
A watchcase made of 2 metals of different colors, typically
steel and gold. |
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