Watch Glossary and Terms with Images

It also controls the movement of the wound gears.LigneTraditional unit of measurement used to measure the diameter of watch movements.LugA thin metal rod fixed between the case horns for attaching the watch strap. 1.Lug 2.Case horns 3.Case 4.Watch strapLuminous paintSelf-illuminating paint that is put on the hands and markers to read the time in low light situations.M ImagesMain PlateBase plate on which all the other parts of a watch movement are mounted (part of the "ébauche").MainspringThe driving spring of a watch or clock, contained in the barrel. Manufacture d'horlogerieFrench term for a watch factory which itself produces the components (particularly the "ébauches") needed for the manufacture of its products (watches, alarm and desk clocks, etc).Marine ChronometerHighly accurate mechanical or electronic timekeeper enclosed in a box (hence the term box chronometer), used for determining the longitude on board ship.The unit of weight for precious stones. One karat equals 0.20 grams.KarruselA device similar to the tourbillon, the difference being that the cage is driven by the third wheel. Invented by Bonnicksen, a Danish watchmaker established in London.L ImagesLeafThe tooth on a pinion.LeverPart of a watch or clock escapement, made in steel or brass. The lever, whose form suggests a ship;s anchor, has a dual function: it transmits energy from the spring via the wheels to the balance in order to maintain its oscillations.