Rolling-element bearing
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In mechanical engineering, a rolling-element bearing, also known as a rolling bearing, is a bearing which carries a load by placing rolling elements between two concentric, grooved rings called races.
Study of ball bearing by Leonardo da Vinci (1452–1519)
A gear bearing
A needle roller bearing
A prematurely failed rear bearing cone from a mountain bicycle, caused by a combination of pitting due to wet conditions, improper lubrication, improper pre-load adjustment, and fatigue from frequent shock loading.
John Harrison
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John Harrison was an English joiner and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea.
Rolling-element bearing
…17th century - Galileo describes the functionality of a caged bearing 1740 - John Harrison invented the first caged roller bearing for H3 marine timekeeping. 1794 - The first patent for the ball race was given to Philip Vaughan of Carmarthen…
Portrait by Thomas King, 1767
Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7)
Harrison's first sea clock, the H1
Harrison's second sea clock, the H2