![]() ![]() The name padparadsha comes from the Sinhalese word for lotus flower. A coupling.Īn orange coloured sapphire that has a pink tone. The oscillating pinion, which comprises a mobile stem and two pinions, allows the chronograph to function very efficiently by replacing the two large wheels of the anterior movements. 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 period of time elapsing between two successive new moons.Ī small diamond that weighs under 1/5 carat or 0.20 carat. Invented by Bonnicksen, a Danish watchmaker established in London.See complication. International term for the rubies in a watch movement.Ī device similar to the tourbillon, the difference being that the cage is driven by the third wheel. Invar (abbreviation of invariable) belongs to the Elinvar family of metals. With its 365.25 days, the Julian year was 11 minutes.Ī metal part that strikes gongs causing them to vibrate and produce sound.Īlloy of iron and nickel whose low coefficient of thermal expansion was discovered by Charles Edouard Guillaume. The calendar now referred to by the majority of countries, introduced in 1582 by Pope Gregory XIII in his reform of the Julian calendar. It regulates the power transferred to the gears. To cut metal with decorative engraving by hand or using an engine turning machine.Ī more or less conical part with spiral grooves for gut, and after circa 1640 chain, which connects to the barrel. In a lever escapement, a small metal pin which prevents accidental movement of the fork. The most common shapes are prismatic, tabular and octahedral. The crystal form of a particular crystal has. ![]() This closed setting is the oldest and most resistant. ![]() The stone is encircled by a strip of metal which is pressed over so as to extend slightly over the girdle. This ornamental gemstone is sometimes used for watch dials. A variety of the quartz group that exists in many different colours and is opaque. ![]()
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