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The mainspring was in vented and put into watches to increase the torque of early watches. https://www.britannica.com/technology/watch -
Early examples of the watch are by Peter Henlein, in Germany Nürnberg. The first watches were used the same as early clocks. https://www.britannica.com/technology/watch -
Until 1580 only iron was the only material in watches then watchmakers tried brass and after that it became mainstream. https://www.britannica.com/technology/watch -
The English physicist Robert Hooke made a watch the incorporated a balance spring, but there is no evidence that the spring was a spiral like it is today. https://www.britannica.com/technology/watch
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The Dutch scientist Christiaan Huygens was probably the first person to create a watch with a spiral balance spring. https://www.britannica.com/technology/watch -
The first patent of jewels on watches was in London which diamonds and sapphires were the most common. https://www.britannica.com/technology/watch -
A clock of any kind in colonial America were a precious thing to own especially watches, until America started to produce their own. https://www.factcite.com/useh/4000623full.html -
Many modern mechanical watches use the lever escapement which was invented by Thomas Mudge in England. https://www.britannica.com/technology/watch -
The first patent on the self winding pocket watch was again taken out in London. https://www.britannica.com/technology/watch -
The first resonance drive types were produced which is the biggest part of an electric watch. https://www.britannica.com/technology/watch/Electric-powered-and-electronic-watches -
In the future of watches there will most likely be a watch the size of a phone today and phones will be a thing of the past, because who wouldn't want a phone secured from their wrist that could do anything of the future.