Definition of Position micrometer. Meaning of Position micrometer. Synonyms of Position micrometer

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Definition of Position micrometer

Position micrometer
Micrometer Mi*crom"e*ter, n. [Micro- + -meter: cf. F. microm[`e]tre.] An instrument, used with a telescope or microscope, for measuring minute distances, or the apparent diameters of objects which subtend minute angles. The measurement given directly is that of the image of the object formed at the focus of the object glass. Circular, or Ring, micrometer, a metallic ring fixed in the focus of the object glass of a telescope, and used to determine differences of right ascension and declination between stars by observations of the times at which the stars cross the inner or outer periphery of the ring. Double image micrometer, a micrometer in which two images of an object are formed in the field, usually by the two halves of a bisected lens which are movable along their line of section by a screw, and distances are determined by the number of screw revolutions necessary to bring the points to be measured into optical coincidence. When the two images are formed by a bisected object glass, it is called a divided-object-glass micrometer, and when the instrument is large and equatorially mounted, it is known as a heliometer. Double refraction micrometer, a species of double image micrometer, in which the two images are formed by the double refraction of rock crystal. Filar, or Bifilar, micrometer. See under Bifilar. Micrometer caliper or gauge (Mech.), a caliper or gauge with a micrometer screw, for measuring dimensions with great accuracy. Micrometer head, the head of a micrometer screw. Micrometer microscope, a compound microscope combined with a filar micrometer, used chiefly for reading and subdividing the divisions of large astronomical and geodetical instruments. Micrometer screw, a screw with a graduated head used in some forms of micrometers. Position micrometer. See under Position. Scale, or Linear, micrometer, a minute and very delicately graduated scale of equal parts used in the field of a telescope or microscope, for measuring distances by direct comparison.

Meaning of Position micrometer from wikipedia

- A filar micrometer is a specialized eyepiece used in astronomical telescopes for astrometry measurements, in microscopes for specimen measurements, and...
- A micrometer, sometimes known as a micrometer **** gauge (MSG), is a device incorporating a calibrated **** for accurate measurement of the size of...
- term "caliper" is often used in contradistinction to micrometer, even though outside micrometers are technically a form of caliper. In this usage, caliper...
- where a simple linear mechanism is adequate. Examples are calipers and micrometers to measure to fine tolerances, on ****tants for navigation, on theodolites...
- concentration in New York City's air of particulate matter measuring 2.5 micrometers or less (PM2.5) was 7.0 micrograms per cubic meter, or 3.0 micrograms...
- Gradually these scales were enclosed for physical protection. Angular micrometer scales were also used (not to be confused with the micrometre device used...
- Typical incremental scale periods vary from hundreds of micrometers down to sub-micrometer. Interpolation can provide resolutions as fine as a nanometer...
- the 28-inch was a survey of stars in 1912, measured with a bifilar position micrometer. In March 1918 the 28 inch took observations of Encke's Comet (1917c)...
- objects (such as in focusing a microscope, moving the anvils of a micrometer, or positioning optics). A differential **** uses a spindle with two **** threads...
- to measure the contours of subjects' faces. He called it the "Beauty Micrometer". Its purpose was to detect even barely-visible structural flaws, that...