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tachometer - Watch or stop watch used for the measurement of speed. Normally a timer or chronograph with a graduated dial or bezel allowing the speed of a vehicle to be figured in miles per hour or kilometers per hour.
tantalum - An extremely hard, metallic element which is gray in color and highly resistant to corrosion. Used in the manufacture of watch cases and bracelets.
telemeter - A watch or stop watch used for the measurement of the distance an object travels over a period of time. It is normally a timer or chronograph with a graduated dial or bezel, allowing the speed of an object to be computed in kilometers or miles per hour wi
Time - Units of measurement of the rotation of the earth on its axis.
time zone - A portion of the earth’s surface where the same time is agreed upon.
timepiece - A watch or clock which displays only the time of day.
timer - A timekeeping instrument used for the measurement of time intervals in fractions of seconds, such as those used at sporting events.
titanium - A strong, lightweight metallic element, gray in color, which is highly resistant to corrosion. It is used in the manufacture of watch cases and bracelets.
tonneau - Style of a rectangular or square wrist watch case that is wider (bowed outward) on the sides of the case in the center and tapers toward both ends.
tourbillon - Self-compensating device designed to overcome various vertical position timing errors. The entire escapement and balance assembly is fitted into a cage, and the complete assembly rotates every 60 seconds.
train - The series of wheels and pinions in a watch or clock comprised of the Center Wheel, Third Wheel, Fourth Wheel and Escape Wheel. The mainspring band and balance assembly are not considered part of the train.
triple calendar - A complicated watch movement with a dial which displays the day, date and month.
tritium - A substance applied to hands and hour markers to make them luminous so they will glow in the dark.
U.T.C. - (Coordinated Universal Time)- The official measurement of time throughout the world, completely independent of all time zones.
up and down indicator - A smaller sub-dial on a watch dial or a separate indicator which displays how much the mainspring is wound up or down. Normally, the dial or indicators read "up and down." “Down” is the zero wound position. “Up” is maximum wound position.
watch case - asymmetrical - A style of watch case that is irregular in shape.
watch case - coin - A watch case in which a coin is used as the case.
watch case - cushion - A style of square wrist watch that is wider (bowed outward) in the center of all four sides of the case.
watch case - round - A style of case that is circular.
watch case - square - A style of watch case in which each of the four sides are equal size.
watch case - tank - A style of rectangular wrist watch case design.
watch case - tonneau - A style of a rectangular or square wrist watch case that is wider (bowed outward) on the sides of the case in the center and tapers toward both ends.
water proof - A design feature of a watch case made to withstand complete submerging. Some waterproof watches are also designed to withstand extreme water pressures, as needed in watches used for scuba diving.
water resistant - A watch designed to withstand rain and splashes of water, but not designed to withstand submerging.
white gold - Yellow gold that is alloyed with palladium.
winding - Procedure to wind a watch mainspring. This can be done by rotating the winding crown on a manual wind watch or automatically by wearing a watch with a rotor winding system in an automatic winding watch.
winding crown - A knob located on the outside of the watch case used for winding the mainspring and setting the time and calendar functions.
World Time Watch - A type of watch which gives the time in different cities in the world by way of a moveable dial.
wrist watch - A watch designed to be worn on the wrist and held on by a strap band or bracelet.
Yacht-Timer - Style of watch used to count down a boat race.
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