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:
“No one makes mistakes. No one runs away
Any more. I bite my lip and
Turn to you. Maybe now you understand.
The feeling is a jewel like a pearl.”
—John Ashbery (b. 1927)
“At sundown, leaving the river road awhile for shortness, we went by way of Enfield, where we stopped for the night. This, like most of the localities bearing names on this road, was a place to name which, in the midst of the unnamed and unincorporated wilderness, was to make a distinction without a difference, it seemed to me.”
—Henry David Thoreau (1817–1862)