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Lexicon Mechanical Watches from A to Z

[ A | B | C | D | E | F | G | H - P | Q - Z ]


A

A/h; vibrations of the balance per hour. Two vibrations make the well-known tick-tock sound of the mechanical watch, known as one oscillation.
Alarm; Watch fitted with a ringing mechanism that is automatically released at the required time.
Amplitude (Vibration); Angle of oscillation for the balance.
Antimagnetic watches; Watches not, or hardly, affected by magnetic fields. For the balance springs of the balance non-magnetic nickel alloys are used.
Automat, Automatic; Synonym for a watch Automaticwith automatic winding. The movement of your wrist makes the rotor (oscillating weight) turn, thereby winding the mainspring of the watch movement.
 


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B

Balance SpringBalance spring; The hairspring and the balance form the oscillating system. The balance spring of an Ulysse Nardin watch consists of a thin and flat wire made of Nivarox.
Balance Wheel
Balance wheel; Part of the escapement of a mechanical watch. Oscillating device which divides the time into equal sections.
Barrel
Barrel; The barrel contains the wound-up mainspring, hooked to it at its outer end and which stores the energy, assuring a power reserve of 36 to 45 hours to the watch. The mainspring is wound up manually by means of the crown (hand winding watch) or trough the movement of the oscillating weight (Rotor) in an automatic watch.
Bridge; brass plate fixed on the main plate by two or more pins and screws. Between the bridge and the plate the wheels and staffs are turning.
Bezel; Top ring for the crystal and/or decorative ring on the upper side of the watch case.


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C

Calibre; Description for a watch movement according to construction, size and factory origin.
Cal.; Abbreviation for Calibre. Synonym for a watch movement defined by construction and size.
Carat; 1 Carat = 1/24 fine gold of a gold alloy. An 18 carat gold alloy contains 18/24 fine gold = 75% fine gold content.
Chronograph; Wrist or pocket watch incorporating an additional stop mechanism (start, stop and back to zero functions).
Chronometer; a watch of extremely high precision and accuracy, tested in several positions and under different temperatures and which has obtained an official rating certificate.
Complication; Additional functions to a watch movement, e.g. chronograph, second time zone, alarm, calendars etc.
Crown; Button to wind up and set the watch to time.


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D

Daily Rate; Term used to denote the difference of time adjustment after 24 hours. There can be differences of up to several seconds per day according to quality and place or quality and wearing conditions.
Date Display; Display of date on the dial of a watch. In mechanical watches discs or bars are used for this purpose, which are connected to the movement by means of transmission wheels.
Differences; In accordance with the type of movement used, the daily rate may vary between -5 to +20 seconds. These tolerances are within the limits laid down by Ulysse Nardin.
Divers Watch; Specially constructed wrist watch for deep sea diving. Divers watches are fitted with screw-in crowns, and they are guaranteed to withstand underwater pressures of 20 ATM (200 m).


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E

Ebauche, Movement Blank; Incomplete watch movement in principle without mainspring and balance. The movement blanks are assembled, refined and completed with the missing parts.
Escapement Wheel; The escapement wheel and the lever build the escapement. It is the last train wheel.
Escapement; Mechanism built in between the gear train and balance wheel. The escapement transfers the power from the gear train in regular and even time sequences to the balance, the oscillating system. Escapement

ETA; ETA SA, leading manufacturer in Switzerland for movements. ETA movements are used for many renowned Swiss watch brands.


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F

Fine Time Adjustment; Regulating lever to adjust the daily time accurately. The majority of Ulysse Nardin watches are fitted with a regulating lever for particularly precise time adjustment.
Frequency; Number of vibrations per hour.

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G

Gasket; The majority of water resistant watches are equipped with gaskets in the case back, the crystal and the crown.
Gear-Train; The system of wheels and pinions which, from the barrel B, transmits the driving power to the escape wheel E, Z1 centre-wheel, Z3 third wheel, Z5 fourth wheel. E escape wheel. All these wheels are riveted to their respective pinions, Z2, Z4, Z6. Gear Train
Glucydur; first rate metal alloy used for balances of top quality.
Gold Plating; Electro deposited layer of gold, the thickness of which is given in microns.

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Watches Sales

The largest collection of
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Watches Sales: The largest collection of watches and clocks on the web