Vernier

/'və:njə/
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Definition
  1. Noun:
    • A small movable scale that slides along a main scale: A vernier is a short auxiliary scale that moves parallel to a main graduated scale. It is calibrated to allow for the precise reading of fractional divisions of the main scale's smallest unit.
    • A person: Paul Vernier (1580–1637), a French mathematician and instrument inventor who described the principle of the vernier scale.
Usage Examples
  • Noun (Instrument scale):
    • The caliper uses a vernier to provide measurements accurate to a hundredth of a millimeter.
    • To read the precise angle, align the zero mark on the vernier with the main scale.
  • Noun (Person):
    • The vernier scale is named after the mathematician Vernier.
Advanced Usage
  • Vernier caliper: A measuring instrument consisting of a main scale and a sliding vernier scale, used for taking precise internal and external measurements.
    • The engineer used a vernier caliper to check the diameter of the piston.
  • Vernier acuity: A term in optics and physiology referring to the ability to detect a misalignment between two lines or gratings; it is a measure of hyperacuity.
    • Vernier acuity is much finer than the resolution limit of the eye's photoreceptors.
Variants and Related Words
  • Vernier scale (n): The specific auxiliary scale mechanism.
    • The vernier scale magnifies the precision of the main scale.
  • Vernier rocket (n): A small thruster on a spacecraft or rocket used for making fine adjustments in velocity or attitude.
    • The spacecraft fired its vernier rockets for a minor course correction.
Synonyms
  • Auxiliary scale: A secondary scale used for finer measurement.
  • Nonius: An older, less common term for a similar device, named after the Portuguese mathematician Pedro Nunes.
Related Phrases
  • Vernier adjustment: A fine, precise adjustment made using a vernier mechanism.
    • Final alignment required a careful vernier adjustment.
Noun
  1. a small movable scale that slides along a main scale; the small scale is calibrated to indicate fractional divisions of the main scale
  2. French mathematician who described the vernier scale (1580-1637)

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