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2 definitions found
 for Micrometer screw
From The Collaborative International Dictionary of English v.0.48 :

  Screw \Screw\ (skr[udd]), n. [OE. scrue, OF. escroue, escroe,
     female screw, F. ['e]crou, L. scrobis a ditch, trench, in
     LL., the hole made by swine in rooting; cf. D. schroef a
     screw, G. schraube, Icel. skr[=u]fa.]
     1. A cylinder, or a cylindrical perforation, having a
        continuous rib, called the thread, winding round it
        spirally at a constant inclination, so as to leave a
        continuous spiral groove between one turn and the next, --
        used chiefly for producing, when revolved, motion or
        pressure in the direction of its axis, by the sliding of
        the threads of the cylinder in the grooves between the
        threads of the perforation adapted to it, the former being
        distinguished as the external, or male screw, or, more
        usually the screw; the latter as the internal, or female
        screw, or, more usually, the nut.
        [1913 Webster]
  
     Note: The screw, as a mechanical power, is a modification of
           the inclined plane, and may be regarded as a
           right-angled triangle wrapped round a cylinder, the
           hypotenuse of the marking the spiral thread of the
           screw, its base equaling the circumference of the
           cylinder, and its height the pitch of the thread.
           [1913 Webster]
  
     2. Specifically, a kind of nail with a spiral thread and a
        head with a nick to receive the end of the screw-driver.
        Screws are much used to hold together pieces of wood or to
        fasten something; -- called also wood screws, and screw
        nails. See also Screw bolt, below.
        [1913 Webster]
  
     3. Anything shaped or acting like a screw; esp., a form of
        wheel for propelling steam vessels. It is placed at the
        stern, and furnished with blades having helicoidal
        surfaces to act against the water in the manner of a
        screw. See Screw propeller, below.
        [1913 Webster]
  
     4. A steam vesel propelled by a screw instead of wheels; a
        screw steamer; a propeller.
        [1913 Webster]
  
     5. An extortioner; a sharp bargainer; a skinflint; a niggard.
        --Thackeray.
        [1913 Webster]
  
     6. An instructor who examines with great or unnecessary
        severity; also, a searching or strict examination of a
        student by an instructor. [Cant, American Colleges]
        [1913 Webster]
  
     7. A small packet of tobacco. [Slang] --Mayhew.
        [1913 Webster]
  
     8. An unsound or worn-out horse, useful as a hack, and
        commonly of good appearance. --Ld. Lytton.
        [1913 Webster]
  
     9. (Math.) A straight line in space with which a definite
        linear magnitude termed the pitch is associated (cf. 5th
        Pitch, 10
        (b) ). It is used to express the displacement of a rigid
            body, which may always be made to consist of a
            rotation about an axis combined with a translation
            parallel to that axis.
            [1913 Webster]
  
     10. (Zool.) An amphipod crustacean; as, the skeleton screw
         ({Caprella). See Sand screw, under Sand.
         [1913 Webster]
  
     Archimedes screw, Compound screw, Foot screw, etc. See
        under Archimedes, Compound, Foot, etc.
  
     A screw loose, something out of order, so that work is not
        done smoothly; as, there is a screw loose somewhere. --H.
        Martineau.
  
     Endless screw, or perpetual screw, a screw used to give
        motion to a toothed wheel by the action of its threads
        between the teeth of the wheel; -- called also a worm.
        
  
     Lag screw. See under Lag.
  
     Micrometer screw, a screw with fine threads, used for the
        measurement of very small spaces.
  
     Right and left screw, a screw having threads upon the
        opposite ends which wind in opposite directions.
  
     Screw alley. See Shaft alley, under Shaft.
  
     Screw bean. (Bot.)
         (a) The curious spirally coiled pod of a leguminous tree
             ({Prosopis pubescens) growing from Texas to
             California. It is used for fodder, and ground into
             meal by the Indians.
         (b) The tree itself. Its heavy hard wood is used for
             fuel, for fencing, and for railroad ties.
  
     Screw bolt, a bolt having a screw thread on its shank, in
        distinction from a key bolt. See 1st Bolt, 3.
  
     Screw box, a device, resembling a die, for cutting the
        thread on a wooden screw.
  
     Screw dock. See under Dock.
  
     Screw engine, a marine engine for driving a screw
        propeller.
  
     Screw gear. See Spiral gear, under Spiral.
  
     Screw jack. Same as Jackscrew.
  
     Screw key, a wrench for turning a screw or nut; a spanner
        wrench.
  
     Screw machine.
         (a) One of a series of machines employed in the
             manufacture of wood screws.
         (b) A machine tool resembling a lathe, having a number of
             cutting tools that can be caused to act on the work
             successively, for making screws and other turned
             pieces from metal rods.
  
     Screw pine (Bot.), any plant of the endogenous genus
        Pandanus, of which there are about fifty species,
        natives of tropical lands from Africa to Polynesia; --
        named from the spiral arrangement of the pineapple-like
        leaves.
  
     Screw plate, a device for cutting threads on small screws,
        consisting of a thin steel plate having a series of
        perforations with internal screws forming dies.
  
     Screw press, a press in which pressure is exerted by means
        of a screw.
  
     Screw propeller, a screw or spiral bladed wheel, used in
        the propulsion of steam vessels; also, a steam vessel
        propelled by a screw.
  
     Screw shell (Zool.), a long, slender, spiral gastropod
        shell, especially of the genus Turritella and allied
        genera. See Turritella.
  
     Screw steamer, a steamship propelled by a screw.
  
     Screw thread, the spiral rib which forms a screw.
  
     Screw stone (Paleon.), the fossil stem of an encrinite.
  
     Screw tree (Bot.), any plant of the genus Helicteres,
        consisting of about thirty species of tropical shrubs,
        with simple leaves and spirally twisted, five-celled
        capsules; -- also called twisted-horn, and twisty.
  
     Screw valve, a stop valve which is opened or closed by a
        screw.
  
     Screw worm (Zool.), the larva of an American fly
        ({Compsomyia macellaria), allied to the blowflies, which
        sometimes deposits its eggs in the nostrils, or about
        wounds, in man and other animals, with fatal results.
  
     Screw wrench.
         (a) A wrench for turning a screw.
         (b) A wrench with an adjustable jaw that is moved by a
             screw.
  
     To put the screws on or To put the screw on, to use
        pressure upon, as for the purpose of extortion; to coerce.
        
  
     To put under the screw or To put under the screws, to
        subject to pressure; to force.
  
     Wood screw, a metal screw with a sharp thread of coarse
        pitch, adapted to holding fast in wood. See Illust. of
        Wood screw, under Wood.
        [1913 Webster]

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

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