Most oignon watches featured a chased brass case, very occasionally.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. This pearl is formed by an oyster, freshwater mussel or other mollusc as a reaction to a tiny invading object that happened to be caught inside.Ī style of watch made in France in the late seventeenth and early eighteenth centuries. The inclusions often form beautiful patterns and are used as watch dials or cases.Ī natural pearl is also called an oriental pearl. It is chalcedony that has dendritic green, red or black inclusions. Lustre can be vitreous.Ī green variety of agate. Its intensity depends on the refractive index of the stone and the quality of its polish. The effect produced by the reflection of light on the surface of a stone. Invented by Bonnicksen, a Danish watchmaker established in London.See complication. In a lever escapement, the impulse occurs via the impulse surface of the wheel tooth and the pallet.Ī means of display in which the hour, shown through an aperture, instantly changes every 60 minutes.Ī device similar to the tourbillon, the difference being that the cage is driven by the third wheel. Movement transmitted by a mechanical part. To cut metal with decorative engraving by hand or using an engine turning machine.Īn oscillating bar with a weight at each ends used as a regulator in the first mechanical timepieces.Ī set of wheels and pinions whereby the movement of one sets all the others in motion.There are different types of gears, e.g. Industrial diamond that is used for polishing.Ī watch movement without the dial or hands in which some or all of the parts have yet to be assembled.Ī means of lighting the dial and/or hands, using either an electroluminscent substance or an electrical system. Imagined by Julien Le Roy circa 1750.See complication. A "dumb" repeater watch in which a hammer strikes the inside of the case to produce a muffled sound.
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