A scale, printed on the dial of a chronograph, to aid in the calculation of average speeds. Tachymeter scales are generally calculated for a kilometer or a mile. The chronograph turns on at the starting point of a measured section, such as at the instant one's car passes a milepost on the side of the road, then turns off again when one's vehicle reaches the end of the measured mile. The chronograph second hand now points to the numbers on the speedometer that correspond to the average speed (in km / h) at which the measured stretch was crossed.

Unlike a bridge (or bar), a tap is screwed to the plate at only one of its two ends. The other end of the clock "floats" freely. Examples of taps include the balance cock, escape wheel cock, etc.

A scale on a chronograph to allow the wearer to read distances directly. The basis for the calculation is the difference between the speeds at which sound waves and light waves propagate through the air. For example, the distance between the wearer and a thunderstorm can be determined as follows: the chronograph turns on the instant a flash of light is seen, then stops when the corresponding thunder is heard. Depending on whether the rangefinder scale is calibrated in kilometers or miles, the chronograph second hand will indicate the number on the rangefinder scale that corresponds to the distance of the storm (in kilometers or miles) from the observer.

Abraham-Louis Breguet (1747-1823) used this word to describe a shock-absorbing system he invented. To protect the delicate pivots of the balance rod, Breguet affixed the corresponding jewels to elastic steel arms.

Unlike bridge movements, almost the entire gear train (except for the pallets, escape wheel, and balance) is supported under an additional plate. Three-quarter plates are used in American and British clocks, and especially in clocks made in Glashütte.

Invented by Abraham-Louis Breguet in 1795 and patented by its inventor in 1801, the tourbillon is a device that compensates for the error of the center of gravity that plagues the oscillating system (balance and spiral) of a mechanical watch. The French word "tourbillon" means "whirlwind". The device is suitably named because it encloses the entire oscillating and escapement system inside a rotating cage of the lowest possible weight. This cage completes a rotation around its axis during a particular unit of time (usually one minute). Thanks to its incessant rotation, a tourbillon compensates for the negative influences that the Earth's gravitational pull exerts on the scale when the watch is held upright, thus leading to corresponding improvements in rhythm accuracy. The tourbillon has no effect on frequency accuracy when the watch is held in a horizontal position. Wrist watches with a tourbillon mechanism were first made as competitors in time trial races in the 40s. Tourbillon wristwatches have been produced in small series since 1986.

In addition to the insignia that make up their names, many watch companies and ébauche manufacturers have also used and continue to use a so-called "trademark." This trademark, an easily recognizable logo, can be placed in various positions on a watch movement. It is often found on the front of the plate in a position normally covered by the dial. Manufacturers of movement blanks sometimes also place their trademarks (along with the caliber number) under the balance next to the balance cock. The cases generally bear the trademark on the inner surface of the back. Some manufacturers make their logo eternal on the outside of the watch, such as on the crown, back, and/or dial.

An electronically tuning fork, oscillating at a frequency of 360 Hz, serves as a regulating organ. The best-known tuning fork watch is Bulova's "Accutron," which debuted in 1960.

Watch case made of a combination of two different coloured metals, e.g. stainless steel and yellow gold, white gold and yellow gold or red gold and yellow gold. The yellow parts of some two-tone cases are simply gold-plated.