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:
“They would probably help, in some trying time to come, to keep the jewel of liberty within the family of freedom.”
—Abraham Lincoln (1809–1865)
“As if, as if, as if the disparate halves
Of things were waiting in a betrothal known
To none, awaiting espousal to the sound
Of right joining, a music of ideas, the burning
And breeding and bearing birth of harmony,
The final relation, the marriage of the rest.”
—Wallace Stevens (1879–1955)