A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole. The hole is typically shaped like a torus and is slightly larger than the shaft diameter. The jewel material is usually some form of synthetic sapphire, such as ruby. Jewel bearings are used in precision instruments, but their largest use is in mechanical watches.
Read more about Jewel Bearing: History, Characteristics, Uses
Famous quotes containing the words jewel and/or bearing:
“What a wonderful phenomenon it is, carefully considered, when the human eye, that jewel of organic structures, concentrates its moist brilliance on another human creature!”
—Thomas Mann (1875–1955)
“A man’s wits are better employed in bearing up under the misfortunes that lie upon him at present than in foreseeing those that may come upon him hereafter.”
—François, Duc De La Rochefoucauld (1613–1680)