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26-Jul-2017 23:14

Various extra features, called "complications", such as moon-phase displays and the different types of tourbillon, are sometimes included.

Modern watches often display the day, date, month and year, and electronic watches may have many other functions.

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

Elizabeth I of England received a wristwatch from Robert Dudley in 1571, described as an arm watch.

They generally incorporate timekeeping functions, but these are only a small subset of the smartwatch's facilities. Watches evolved from portable spring-driven clocks, which first appeared in 15th century Europe.

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It is designed to keep working despite the motions caused by the person's activities.

Early models were essentially standard pocket-watches fitted to a leather strap but, by the early 20th century, manufacturers began producing purpose-built wristwatches.

The Swiss company Dimier Frères & Cie patented a wristwatch design with the now standard wire lugs in 1903.

Improvements in manufacturing such as the tooth-cutting machine devised by Robert Hooke allowed some increase in the volume of watch production, although finishing and assembling was still done by hand until well into the 19th century.

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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.

Although there was an attempt to modernise clock manufacture with mass production techniques and the application of duplicating tools and machinery by the British Watch Company in 1843, it was in the United States that this system took off.

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