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词汇 disc micrometer
释义

Definition of disc micrometer in English:

disc micrometer

(US disk micrometer)
noun

  • 1Astronomy a micrometer in which the image in a telescope or microscope is made to fall on a circular disc, placed at such a position as to match the image in diameter, the position and diameter of the disc then allowing the angular size of the image to be calculated; now rare and historical.

  • 2Engineering a micrometer in which the two jaws end in a circular disc to provide a larger grasping area.

Origin

Late 19th century; earliest use found in American Journal of Science.

Definition of disc micrometer in US English:

disc micrometer

(US disk micrometer)
noun

  • 1Astronomy a micrometer in which the image in a telescope or microscope is made to fall on a circular disc, placed at such a position as to match the image in diameter, the position and diameter of the disc then allowing the angular size of the image to be calculated; now rare and historical.

  • 2Engineering a micrometer in which the two jaws end in a circular disc to provide a larger grasping area.

Origin

Late 19th century; earliest use found in American Journal of Science.
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