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:
“The lakes are something which you are unprepared for; they lie up so high, exposed to the light, and the forest is diminished to a fine fringe on their edges, with here and there a blue mountain, like amethyst jewels set around some jewel of the first water,—so anterior, so superior, to all the changes that are to take place on their shores, even now civil and refined, and fair as they can ever be.”
—Henry David Thoreau (1817–1862)
“When we our betters see bearing our woes,
We scarcely think our miseries our foes.
Who alone suffers, suffers most i’ the mind,
Leaving free things and happy shows behind.
But then the mind much sufferance doth o’er skip,
When grief hath mates, and bearing fellowship.”
—William Shakespeare (1564–1616)