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Horology A ~ Z

Horology T
Tachymeter /
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.
Tang Buckle The traditional strap attachment involving a pin (called a tang) and buckle.

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.

Telemeter A chronograph scale for measuring distance based on the time it takes the sound to reach the observer.
Terminage French term denoting the process of assembling watch parts for the account of a producer.
3 - piece case A traditional watchcase consisting of a case middle, bezel, and back.
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.
Time Lock Time lock is one kind of combination lock which use a clock mechanism to secure a safe.
Time-only Watch A watch that tells the time without any complications, such as a chronograph or a date watch.

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.

Tonneau A watchcase which is shaped like a barrel.
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.
Train A series of wheels in a watch or a clock; the power train or gear train.
Tricompax A chronograph with 3 sub-dials at 3, 6, and 9 o'clock.
Triple Calendar A dial displaying the day, date, and month.
Tritium A slightly radioactive substance used to make hands or hour markers glow in the dark.
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.

Two Tone A watchcase made of 2 metals of different colors, typically steel and gold.

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