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Micrometer   Listen
noun
Micrometer  n.  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 micrometer, 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 micrometer, or Bifilar micrometer. See under Bifilar.
Micrometer caliper or Micrometer 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; turning the head one full revolution advances the position of the tip of the screw only by a little.
Position micrometer. See under Position.
Scale micrometer, 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.






Collaborative International Dictionary of English 0.48








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"Micrometer" Quotes from Famous Books



... in any other way, the man got on his knees and picked up an enormous tuning fork, whose prongs were about three feet long, and he made some adjustment in the fork of it that took about five minutes. He might have been turning the screw of a micrometer; I could not see. Then, raising the fork above his shoulder, he struck the floor with it, and a master-note as clear as the peal of a bell went ringing up ...
— Caves of Terror • Talbot Mundy

... with which a prominence shoots upward from the sun's limb can, of course, be measured directly by observations of the ordinary kind with a micrometer. The spectroscope, however, enables us to estimate the speed with which disturbances at the surface of the sun travel in the direction towards the earth or from the earth. We can measure this speed ...
— The Story of the Heavens • Robert Stawell Ball

... times as heavy and so on. Scales specially constructed for measuring silver and gold buttons may be purchased; but it is much better to make the measurement with the help of a microscope provided with an eyepiece micrometer. ...
— A Textbook of Assaying: For the Use of Those Connected with Mines. • Cornelius Beringer and John Jacob Beringer

... The nests and eggs of the numerous sub-species are all precisely the same as those of this bird, so we will but enumerate the varieties and their range. To identify these varieties other than by their ranges will require micrometer calipers and the services of the men who ...
— The Bird Book • Chester A. Reed

... phytozoaria^; microbe; grub; tit, tomtit, runt, mouse, small fry; millet seed, mustard seed; barleycorn; pebble, grain of sand; molehill, button, bubble. point; atom &c (small quantity) 32; fragment &c (small part) 51; powder &c 330; point of a pin, mathematical point; minutiae &c (unimportance) 643. micrometer; vernier; scale. microphotography, photomicrography, micrography^; photomicrograph, microphotograph; microscopy; microscope (optical instruments) 445. V. be little &c adj.; lie in a nutshell; become small &c (decrease) 36, (contract) ...
— Roget's Thesaurus of English Words and Phrases: Body • Roget

... for thousands upon thousands of kilometers. The signal lamps upon the pilot's panel were dark, its warning bells were silent. A brilliant point of white in the center of the pilot's closely ruled micrometer grating, exactly upon the cross-hairs of his directors, showed that the immense vessel was precisely upon the calculated course, as laid down by the automatic integrating course-plotters. Everything was quiet ...
— Triplanetary • Edward Elmer Smith



Words linked to "Micrometer" :   caliper, micromillimeter, calliper, vernier micrometer, nm, micromillimetre, micrometer gauge, millimicron, nanometre, millimeter, micrometer caliper, mm



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