Dial
Tachymeter
A scale used with a chronograph to calculate average speed.
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Watch Glossary
Explore essential terminology from movements and complications to collector language, materials and finishing.
6 terms
Dial
Telemeter
A scale used to estimate distance based on the speed of sound.
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Tourbillon
A rotating cage containing the escapement and balance, designed to average positional errors.
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Tritium
A radioactive luminous material used historically on watch dials.
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Tropical Dial
A dial that has changed colour through ageing and environmental exposure.
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True GMT
A GMT architecture in which the local hour hand can be adjusted independently.
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