Definition of Micrometer screw. Meaning of Micrometer screw. Synonyms of Micrometer screw

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Definition of Micrometer screw

Micrometer screw
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 Micrometer screw from wikipedia

- A micrometer, sometimes known as a micrometer **** gauge (MSG), is a device incorporating a calibrated **** widely used for accurate measurement of...
- Micrometer can mean: Micrometer (device), used for accurate measurements by means of a calibrated **** Micrometre, a millionth of a metre This disambiguation...
- **** for measurement, rather than a slide, is called an external micrometer caliper gauge, a micrometer caliper or, more often, simply a micrometer....
- Watt called his instrument a micrometer, a term now used with a different meaning in engineering (the micrometer **** gauge). It consisted of two parallel...
- microscope, moving the anvils of a micrometer, or positioning optics). A differential **** uses a spindle with two **** threads of differing leads (in case...
- key components of micrometers and lathes. There are three steps in manufacturing a ****: heading, thread rolling, and coating. ****s are normally made...
- two electrodes very close together, one of which was attached to a micrometer **** with a calibrated dial, so by turning a **** the width of the gap could...
- A **** thread is a helical structure used to convert between rotational and linear movement or force. A **** thread is a ridge wrapped around a cylinder...
- divided in half millimeters. Fine adjustments are made by means of a micrometer **** for taking accurate reading. Both vernier reading to 0.01mm or 0.02mm...
- filar micrometer consists of a reticle that has two fine parallel wires or threads that can be moved by the observer using a micrometer **** mechanism...