Hamilton watch dating

The concept of the wristwatch goes back to the production of the very earliest watches in the 16th century.

A major cause of error in balance wheel timepieces, caused by changes in elasticity of the balance spring from temperature changes, was solved by the bimetallic temperature compensated balance wheel invented in 1765 by Pierre Le Roy and improved by Thomas Earnshaw.

Some watches use radio clock technology to regularly correct the time.

Developments in the 2010s include smartwatches, which are elaborate computer-like electronic devices designed to be worn on a wrist.

The lever escapement was the single most important technological breakthrough, and was invented by Thomas Mudge in 1759 and improved by Josiah Emery in 1785, although it only gradually came into use from about 1800 onwards, chiefly in Britain.

The British had predominated in watch manufacture for much of the 17th and 18th centuries, but maintained a system of production that was geared towards high quality products for the elite.

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