Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A fine coiled spring that regulates the movement of the balance wheel in a watch or clock.

from The Century Dictionary.

  • noun In watch-making, the fine hair-like spring coiled up within the balance-wheel and imparting motion to it.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Horology) The slender recoil spring which regulates the motion of the balance in a timepiece.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A spring, made of a coil of fine wire, that is used to regulate the movement of a balance wheel in a watch.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a fine spiral spring that regulates the movement of the balance wheel in a timepiece

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

hair +‎ spring

Examples

  • A Henry Grendon yellow gold and enamel pre-hairspring verge watch, circa 1640.

    Big Time: The British Pocket Watch

  • In general order of accuracy, these methods include a piezoelectric accelerometer, a coiled spring mechanism, and a hairspring mechanism.

    The Small Change Diet

  • In general order of accuracy, these methods include a piezoelectric accelerometer, a coiled spring mechanism, and a hairspring mechanism.

    The Small Change Diet

  • When he thought about it, however, he decided that, of course, the criminalist had indeed ordered it taken apart, down to the last hairspring and jewel, for the forensics team but then had it reassembled perfectly.

    The Burning Wire

  • When he thought about it, however, he decided that, of course, the criminalist had indeed ordered it taken apart, down to the last hairspring and jewel, for the forensics team but then had it reassembled perfectly.

    The Burning Wire

  • Watches with hairspring wheels work in a similar way.

    THE GREATEST SHOW ON EARTH

  • Man-made clocks work on timescales that are very short by evolutionary standards – hours, minutes, seconds – and the time-dependent processes they use are fast: the swinging of a pendulum, the swivelling of a hairspring, the oscillation of a crystal, the burning of a candle, the draining of a water vessel or an hourglass, the rotation of the earth registered by a sundial.

    THE GREATEST SHOW ON EARTH

  • Watches with hairspring wheels work in a similar way.

    THE GREATEST SHOW ON EARTH

  • Man-made clocks work on timescales that are very short by evolutionary standards – hours, minutes, seconds – and the time-dependent processes they use are fast: the swinging of a pendulum, the swivelling of a hairspring, the oscillation of a crystal, the burning of a candle, the draining of a water vessel or an hourglass, the rotation of the earth registered by a sundial.

    THE GREATEST SHOW ON EARTH

  • Pendleton asked Hamilton if he wanted the hairspring set a hairspring is a mechanism that would give the trigger a much lighter touch.

    Alexander Hamilton, American

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