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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.
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. Jewel bearings are used in precision instruments ...
Download as PDF; Printable version; In other projects Wikidata item; ... 17 jewels, 21600vph, reserve 42h) 2850 (manual wind, sweep-second, 17 jewels, 28800vph ...
The involved victims range in age from 14 to 27, including a 15-year-old girl and a 17-year-old girl, the chief said. On Wednesday, the chief said one person had been released while eight others ...
The Model 23 was a 16-size chronograph pocket watch. The Model 4992b was in a 16-size case with a black dial. It was used as the pocket watch for the U.S. military, featuring a less accurate 21-jewel railroad grade movement. [citation needed] By 1970, 13,086 Hamilton Model 21 Marine Chronometers had been produced.
In rural Georgia, a 10-year-old boy left home and walked a mile down the road to another town, where a concerned citizen called law enforcement. Deputies then arrested the boy’s mother, igniting ...
Attorneys for defendant Nima Momeni on Tuesday wrapped up their closing argument with a surprise video clip they claimed showed stabbing victim and Cash App founder Bob Lee doing cocaine with the ...
The fourth period began in the early 1930s, and is characterized by the Streamline Moderne influence on the styling of the cases. Many of these watches featured a new 207 movement, 12/0-size with 17 jewels (of which only 40,000 were made) and included such sleek designs as the Futura, Chesterfield, Wentworth, Andover, and the 14kt Rockliffe.