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micrometer

The Columbia Encyclopedia, Sixth Edition

micrometer . 1 Instrument used for measuring extremely small distances. Typical examples are devices used in astronomical telescopes to measure the apparent diameter of celestial objects and similar devices used in microscopes. In both of these devices a fine hair or filament is moved from one extremity to the other of the image of an object and the distance read on a calibrated scale. Another typical micrometer is the micrometer caliper, a device in which an object to be measured is enclosed between two jaws, one fixed and the other movable by means of a fine screw. When the jaws are just touching the object, the distance between the jaws can be read on an associated scale, often to an accuracy of 10 -4 (one ten-thousandth) in., or 10 -6 (one millionth) m. 2 Unit of linear distance equal to 10 -6 (one millionth) m. It was formerly known as a micron.

Author not available, MICROMETER., The Columbia Encyclopedia, Sixth Edition 2008


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The Columbia Encyclopedia, Sixth Edition. Copyright 2008 Columbia University Press

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micrometer
micrometer An instrument used in astronomy for measuring angular distances and relative positions on the sky. Micrometers are used particularly for measuring the orbital motions...locations of features on planets. There are many types of micrometer, but all introduce standard reference points into the... Read more
micrometer
micrometer • cater , crater, creator, curator, data, debater...centimeter) • nanometre ( US nanometer) • micrometer , micrometre • decametre ( US dekameter) •...anemometer, barometer, gasometer, geometer, manometer, micrometer, milometer, olfactometer, optometer, pedometer, ... Read more
filar micrometer
filar micrometer A device for measuring the separations...precisely against a scale. Many filar micrometers can also be rotated against an angular...such a device is known as a position micrometer . Both separation and position angle... Read more
position micrometer
position micrometer See filar micrometer . Read more
cross-wire micrometer
cross-wire micrometer A simple form of micrometer, consisting of two non-parallel wires, webs, or bars, usually in the form of a cross, in the field of view of an eyepiece. The eyepiece is oriented so that the wires cross the field diagonally... Read more

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