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)