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3 definitions found
 for caliber compasses
From The Collaborative International Dictionary of English v.0.48 :

  Compasses \Com"pass*es\, n., pl.
     An instrument for describing circles, measuring figures,
     etc., consisting of two, or (rarely) more, pointed branches,
     or legs, usually joined at the top by a rivet on which they
     move.
     [1913 Webster]
  
     Note: The compasses for drawing circles have adjustable pen
           points, pencil points, etc.; those used for measuring
           without adjustable points are generally called
           dividers. See Dividers.
           [1913 Webster]
  
     Bow compasses. See Bow-compass.
  
     Caliber compasses, Caliper compasses. See Calipers.
  
     Proportional, Triangular, etc., compasses. See under
        Proportional, etc.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Caliber \Cal"i*ber\, Calibre \Cal"ibre\, n. [F. calibre, perh.
     fr. L. qualibra of what pound, of what weight; hence, of what
     size, applied first to a ball or bullet; cf. also Ar.
     q[=a]lib model, mold. Cf. Calipers, Calivere.]
     [1913 Webster]
     1. (Gunnery) The diameter of the bore, as a cannon or other
        firearm, or of any tube; or the weight or size of the
        projectile which a firearm will carry; as, an 8 inch gun,
        a 12-pounder, a 44 caliber.
        [1913 Webster]
  
              The caliber of empty tubes.           --Reid.
        [1913 Webster]
  
              A battery composed of three guns of small caliber.
                                                    --Prescott.
        [1913 Webster]
  
     Note: The caliber of firearms is expressed in various ways.
           Cannon are often designated by the weight of a solid
           spherical shot that will fit the bore; as, a
           12-pounder; pieces of ordnance that project shell or
           hollow shot are designated by the diameter of their
           bore; as, a 12 inch mortar or a 14 inch shell gun;
           small arms are designated by hundredths of an inch
           expressed decimally; as, a rifle of .44 inch caliber.
           [1913 Webster]
  
     2. The diameter of round or cylindrical body, as of a bullet
        or column.
        [1913 Webster]
  
     3. Fig.: Capacity or compass of mind. --Burke.
        [1913 Webster]
  
     Caliber compasses. See Calipers.
  
     Caliber rule, a gunner's calipers, an instrument having two
        scales arranged to determine a ball's weight from its
        diameter, and conversely.
  
     A ship's caliber, the weight of her armament.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Calipers \Cal"i*pers\, n. pl. [Corrupted from caliber.]
     An instrument, usually resembling a pair of dividers or
     compasses with curved legs, for measuring the diameter or
     thickness of bodies, as of work shaped in a lathe or planer,
     timber, masts, shot, etc.; or the bore of firearms, tubes,
     etc.; -- called also caliper compasses, or caliber
     compasses.
     [1913 Webster]
  
     Caliper square, a draughtsman's or mechanic's square,
        having a graduated bar and adjustable jaw or jaws.
        --Knight.
  
     Vernier calipers. See Vernier.
        [1913 Webster]

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