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balance spring

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noun Horology.
  1. hairspring.
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Origin of balance spring

First recorded in 1880–85
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for balance spring

Historical Examples

  • The balance-spring is attached at its outer end to a fixed stud R, and at its inner end to staff of balance.

    The Library of Work and Play: Mechanics, Indoors and Out

    Fred T. Hodgson

  • This balance compensates both for its own expansion and contraction, and that of the balance-spring.