Watch cogs. Internal cogs and gears of a watch escapement. The red circles are ruby jewels used in bearings. An escapement is a device within a watch which provides periodic impulses to the balance wheel that helps to regulate time keeping. Jewels, whether natural or manmade, are used in watch bearings because their smooth surfaces offer little friction resistance and are hardwearing. Photograph of a 17jewel Roamer watch from Switzerland.
Work by David Parker
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