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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.
In watches during setting it is turned by the minute wheel, which is turned by the keyless works. In older clocks the setting was done by opening the face and manually pushing the minute hand which rotated the cannon pinion directly. A minute wheel whose pinion drives the hour wheel. During setting it is driven by the intermediate wheel in the ...
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The Official Foot Ball Guide, containing official rules of the game, predated the Spalding Athletic Library, first being issued by Spalding in 1887. [88] This annual publication actually carried forward a series of earlier football guides edited by Hall of Fame coach Walter Camp from 1884 to 1886, published by Wright and Ditson. [ 88 ]
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Athletic contests in running, walking, jumping and throwing are among the oldest of all sports and their roots are prehistoric. [3] Athletics events were depicted in the Ancient Egyptian tombs in Saqqara , with illustrations of running at the Heb Sed festival and high jumping appearing in tombs from as early as of 2250 BC. [ 4 ]
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