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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 jewels are typically made from the mineral corundum , usually either synthetic sapphire or synthetic ruby .
In the three axis tourbillon movement, the 3rd (external) cage has a unique form which provides the possibility of using jewel bearings everywhere, instead of ball-bearings. This is a unique solution at this size and level of complication. [11] There are a few wrist and pocket watches that include the Triple Axis or Tri-Axial Tourbillon ...
A kenning (Old English kenning [cʰɛnːiŋɡ], Modern Icelandic [cʰɛnːiŋk]) is a circumlocution, an ambiguous or roundabout figure of speech, used instead of an ordinary noun in Old Norse, Old English, and later Icelandic poetry. This list is not intended to be comprehensive. Kennings for a particular character are listed in that character ...
Aspects of this fictional novel are inspired by historical events. The jewel-bearing plant is based on a real factory in Turtle Mountain where mostly women were employed. [17] While an attempt in 1955 to unionize failed, the workers succeeded in their demand for higher pay and better working conditions. [18]
Jewel bearing of a balance wheel, supported by a lyre-shaped spring. The Incabloc shock protection system is the trade name for a spring-loaded mounting system for the jewel bearings that support the balance wheel in a mechanical watch, to protect the wheel's delicate pivots from damage in the event of physical shock, such as if the watch is dropped.
In watches and some high quality clocks their arbors have jewel bearings. The going train in a modern clock or watch consists of: First or great wheel attached and ratcheted to the main spring, or cable, barrel. The ratchet allows the main spring or cable barrel to be wound without turning the wheel.
For watch bearings, a jewel bearing made of ruby, comprising a ring (the "hole") with a sink for oil, is invented by Nicholas Facio with Peter and Jacob Debaufre, who use pierced natural rubies. Other gemstones are used subsequently, including garnet (which is too soft) and diamond ; in the 20th century, synthetic ruby or sapphire becomes ...
An example of this regulation being a fifteenth century law from Germany that prohibited women from displaying more than one gold chain at a time. [ 4 ] By the end of the period, the types of personal jewelry worn by wealthy women were not very different from those found today, with rings, necklaces, brooches, lockets and (less often) earrings ...