Movement of a pendulum or oscillating body between two extreme positions (A' and A''). A die of this motif guides the movement of the tool on a specially-adapted rose engine.Ī watch whose dial shows the time of places in different time zones. Under certain conditions, it.Ī toothed segment used in certain passing strike mechanisms that do not have a count wheel (locking plate).Ī spring that releases the cover on a hunter watch case.Ī pattern of repetitive motifs, similar to a tapestry. Quartz has the specific property of vibrating at a very high frequency (32 MHz) placed under electric current. In a self-winding movement, a heavy metal disc that turns freely in both directions to wind the mainspring.See rotor.Ī heavy metal, greyish white, that is highly resistant to corrosion and difficult to work with.Jewellery and watch cases can be made from platinum. Pearls and cultured pearls are covered with nacre by certain species of oysters and mussels. The iridescent substance secreted by molluscs around a foreign object. The Greenwich meridian is taken as the prime meridian. The meridian of a given location is the circle that intersects it and the two poles. Invented by Bonnicksen, a Danish watchmaker established in London.See complication.Ī thin metal rod fixed between the case horns for attaching the watch strap.Īn imaginary circle intersecting the Earth's poles. ![]() The movement of a quality watch has between 15 and 21 jewels.Ī device similar to the tourbillon, the difference being that the cage is driven by the third wheel. The international term for the jewels (rubies) in a watch movement that are used as bearings for pivots to reduce friction. Horns come in various shapes and are attached to the case middle.Ī small toothed wheel, part of the hand-setting mechanism. That part of a watch case to which the strap is attached. In striking clocks and watches, the fly wheel has vanes which regulate the speed of the striking train. ![]() In a brilliant cut diamond, the crown facets will produce fire.Ī device for slowing and regulating motion. The spectral colours that occur when a ray of light is transmitted through two facets at an angle. The different parts (case, dial, hands, crystal, crown, etc.) that help to give the watch its finished and functional appearance. ![]() The step of diamond cutting used to give a rough diamond its shape.Ī part that is profiled to transform or modify motion.įor example, a cam is used to reset the chronograph hand or activate the hammers in a minute-repeater. Arabic numerals, which were widely used on watch dials towards the eighteenth century, allow greater scope for fantasy than their Roman counterparts.
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