PREVIEW

... rspring.

In the 21st century.

  The hairspring has been optimized to the limit, becoming a rather thin helical spring, 99.9% of which are used in mechanical watches.

  It is about 3 to 4 times thinner than human hair, with a total weight of about 2mg, but it can withstand a tension of 600g, and its toughness is quite strong.

  In clocks and watches, the inner end of the hairspring is fixed to the axis of the balance wheel, and the outer end is fixed to the balance co ...

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