Definition of Double refraction micrometer. Meaning of Double refraction micrometer. Synonyms of Double refraction micrometer

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Definition of Double refraction micrometer

Double refraction 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 Double refraction micrometer from wikipedia

- (double refraction) of "Iceland crystal" (transparent calcite), on the ****umption that the secondary waves are spherical for the ordinary refraction (which...
- the theory of comets, the tides, the law of continuity, the double refraction micrometer, and various problems of spherical trigonometry.[citation needed]...
- atmospheric refraction. The change of air density with elevation causes the line of sight to bend toward the earth. The combined correction for refraction and...
- magnified virtual image 6. The objective in a refracting telescope refracts or bends light. This refraction causes parallel light rays to converge at a...
- core surrounded by a transparent cladding material with a lower index of refraction. Light is kept in the core by the phenomenon of total internal reflection...
- The University Press. p. 7–. "Results of Micrometer Measures of Double Stars made with 28-inch Refractor at the Royal Observatory, Greenwich, the year...
- precision lathes meant that lens designs could be manufactured to sub-micrometer levels of accuracy thereby offering the prospect of high volume production...
- telescope. Some of the instruments for the 40-inch refractor (circa 1890s) were: Filar Micrometer Solar spectrograph Spectroheliograph Stellar spectrograph...
- resolution by further refraction, additional resolution is obtained by inserting an immersion medium with a higher index of refraction between the lens and...
- Great Refractor (also known as the Grande Lunette) is a double telescope with lenses (83 cm + 62 cm), in Meudon, France. It is a twin refracting telescope...