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2 definitions found
 for Ring micrometer
From The Collaborative International Dictionary of English v.0.48 :

  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.
     [1913 Webster]
  
     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.
        [1913 Webster] Micrometric

From The Collaborative International Dictionary of English v.0.48 :

  Ring \Ring\, n. [AS. hring, hrinc; akin to Fries. hring, D. & G.
     ring, OHG. ring, hring, Icel. hringr, DAn. & SW. ring; cf.
     Harangue,+Rank+a+row,{Rink">Russ. krug'. Cf. Harangue, Rank a row,{Rink.]
     A circle, or a circular line, or anything in the form of a
     circular line or hoop.
     [1913 Webster]
  
     2. Specifically, a circular ornament of gold or other
        precious material worn on the finger, or attached to the
        ear, the nose, or some other part of the person; as, a
        wedding ring.
        [1913 Webster]
  
              Upon his thumb he had of gold a ring. --Chaucer.
        [1913 Webster]
  
              The dearest ring in Venice will I give you. --Shak.
        [1913 Webster]
  
     3. A circular area in which races are or run or other sports
        are performed; an arena.
        [1913 Webster]
  
              Place me, O, place me in the dusty ring,
              Where youthful charioteers contend for glory. --E.
                                                    Smith.
        [1913 Webster]
  
     4. An inclosed space in which pugilists fight; hence,
        figuratively, prize fighting. "The road was an
        institution, the ring was an institution." --Thackeray.
        [1913 Webster]
  
     5. A circular group of persons.
        [1913 Webster]
  
              And hears the Muses in a ring
              Aye round about Jove's alter sing.    --Milton.
        [1913 Webster]
  
     6. (Geom.)
        (a) The plane figure included between the circumferences
            of two concentric circles.
        (b) The solid generated by the revolution of a circle, or
            other figure, about an exterior straight line (as an
            axis) lying in the same plane as the circle or other
            figure.
            [1913 Webster]
  
     7. (Astron. & Navigation) An instrument, formerly used for
        taking the sun's altitude, consisting of a brass ring
        suspended by a swivel, with a hole at one side through
        which a solar ray entering indicated the altitude on the
        graduated inner surface opposite.
        [1913 Webster]
  
     8. (Bot.) An elastic band partly or wholly encircling the
        spore cases of ferns. See Illust. of Sporangium.
        [1913 Webster]
  
     9. A clique; an exclusive combination of persons for a
        selfish purpose, as to control the market, distribute
        offices, obtain contracts, etc.
        [1913 Webster]
  
              The ruling ring at Constantinople.    --E. A.
                                                    Freeman.
        [1913 Webster]
  
     Ring armor, armor composed of rings of metal. See Ring
        mail, below, and Chain mail, under Chain.
  
     Ring blackbird (Zool.), the ring ousel.
  
     Ring canal (Zool.), the circular water tube which surrounds
        the esophagus of echinoderms.
  
     Ring dotterel, or Ringed dotterel. (Zool.) See
        Dotterel, and Illust. of Pressiroster.
  
     Ring dropper, a sharper who pretends to have found a ring
        (dropped by himself), and tries to induce another to buy
        it as valuable, it being worthless.
  
     Ring fence. See under Fence.
  
     Ring finger, the third finger of the left hand, or the next
        the little finger, on which the ring is placed in
        marriage.
  
     Ring formula (Chem.), a graphic formula in the shape of a
        closed ring, as in the case of benzene, pyridine, etc. See
        Illust. under Benzene.
  
     Ring mail, a kind of mail made of small steel rings sewed
        upon a garment of leather or of cloth.
  
     Ring micrometer. (Astron.) See Circular micrometer, under
        Micrometer.
  
     Saturn's rings. See Saturn.
  
     Ring ousel. (Zool.) See Ousel.
  
     Ring parrot (Zool.), any one of several species of Old
        World parrakeets having a red ring around the neck,
        especially Palaeornis torquatus, common in India, and
        Palaeornis Alexandri of Java.
  
     Ring plover. (Zool.)
        (a) The ringed dotterel.
        (b) Any one of several small American plovers having a
            dark ring around the neck, as the semipalmated plover
            ({Aegialitis semipalmata).
  
     Ring snake (Zool.), a small harmless American snake
        ({Diadophis punctatus) having a white ring around the
        neck. The back is ash-colored, or sage green, the belly of
        an orange red.
  
     Ring stopper. (Naut.) See under Stopper.
  
     Ring thrush (Zool.), the ring ousel.
  
     The prize ring, the ring in which prize fighters contend;
        prize fighters, collectively.
  
     The ring.
        (a) The body of sporting men who bet on horse races.
            [Eng.]
        (b) The prize ring.
            [1913 Webster]

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