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:
“As a jewel of gold in a swine’s snout, so is a fair woman which is without discretion.”
—Bible: Hebrew Proverbs, 11:22.
“There was ease in Casey’s manner as he stepped into his place,
There was pride in Casey’s bearing and a smile on Casey’s face;”
—Ernest Lawrence Thayer (1863–1940)