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2 definitions found
 for Pitch circle
From The Collaborative International Dictionary of English v.0.48 :

  Pitch \Pitch\, n.
     1. A throw; a toss; a cast, as of something from the hand;
        as, a good pitch in quoits.
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     Pitch and toss, a game played by tossing up a coin, and
        calling "Heads or tails;" hence:
     To play pitch and toss with (anything), to be careless or
        trust to luck about it. "To play pitch and toss with the
        property of the country." --G. Eliot.
     Pitch farthing. See Chuck farthing, under 5th Chuck.
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     2. (Cricket) That point of the ground on which the ball
        pitches or lights when bowled.
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     3. A point or peak; the extreme point or degree of elevation
        or depression; hence, a limit or bound.
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              Driven headlong from the pitch of heaven, down
              Into this deep.                       --Milton.
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              Enterprises of great pitch and moment. --Shak.
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              To lowest pitch of abject fortune.    --Milton.
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              He lived when learning was at its highest pitch.
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              The exact pitch, or limits, where temperance ends.
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     4. Height; stature. [Obs.] --Hudibras.
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     5. A descent; a fall; a thrusting down.
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     6. The point where a declivity begins; hence, the declivity
        itself; a descending slope; the degree or rate of descent
        or slope; slant; as, a steep pitch in the road; the pitch
        of a roof.
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     7. (Mus.) The relative acuteness or gravity of a tone,
        determined by the number of vibrations which produce it;
        the place of any tone upon a scale of high and low.
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     Note: Musical tones with reference to absolute pitch, are
           named after the first seven letters of the alphabet;
           with reference to relative pitch, in a series of tones
           called the scale, they are called one, two, three,
           four, five, six, seven, eight. Eight is also one of a
           new scale an octave higher, as one is eight of a scale
           an octave lower.
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     8. (Mining) The limit of ground set to a miner who receives a
        share of the ore taken out.
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     9. (Mech.)
        (a) The distance from center to center of any two adjacent
            teeth of gearing, measured on the pitch line; --
            called also circular pitch.
        (b) The length, measured along the axis, of a complete
            turn of the thread of a screw, or of the helical lines
            of the blades of a screw propeller.
        (c) The distance between the centers of holes, as of rivet
            holes in boiler plates.
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     10. (Elec.) The distance between symmetrically arranged or
         corresponding parts of an armature, measured along a
         line, called the pitch line, drawn around its length.
         Sometimes half of this distance is called the pitch.
     Concert pitch (Mus.), the standard of pitch used by
        orchestras, as in concerts, etc.
     Diametral pitch (Gearing), the distance which bears the
        same relation to the pitch proper, or circular pitch, that
        the diameter of a circle bears to its circumference; it is
        sometimes described by the number expressing the quotient
        obtained by dividing the number of teeth in a wheel by the
        diameter of its pitch circle in inches; as, 4 pitch, 8
        pitch, etc.
     Pitch chain, a chain, as one made of metallic plates,
        adapted for working with a sprocket wheel.
     Pitch line, or Pitch circle (Gearing), an ideal line, in
        a toothed gear or rack, bearing such a relation to a
        corresponding line in another gear, with which the former
        works, that the two lines will have a common velocity as
        in rolling contact; it usually cuts the teeth at about the
        middle of their height, and, in a circular gear, is a
        circle concentric with the axis of the gear; the line, or
        circle, on which the pitch of teeth is measured.
     Pitch of a roof (Arch.), the inclination or slope of the
        sides expressed by the height in parts of the span; as,
        one half pitch; whole pitch; or by the height in parts of
        the half span, especially among engineers; or by degrees,
        as a pitch of 30[deg], of 45[deg], etc.; or by the rise
        and run, that is, the ratio of the height to the half
        span; as, a pitch of six rise to ten run. Equilateral
        pitch is where the two sloping sides with the span form an
        equilateral triangle.
     Pitch of a plane (Carp.), the slant of the cutting iron.
     Pitch of poles (Elec.), the distance between a pair of
        poles of opposite sign.
     Pitch pipe, a wind instrument used by choristers in
        regulating the pitch of a tune.
     Pitch point (Gearing), the point of contact of the pitch
        lines of two gears, or of a rack and pinion, which work
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From The Collaborative International Dictionary of English v.0.48 :

  Circle \Cir"cle\ (s[~e]r"k'l), n. [OE. cercle, F. cercle, fr. L.
     circulus (Whence also AS. circul), dim. of circus circle,
     akin to Gr. kri`kos, ki`rkos, circle, ring. Cf. Circus,
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     1. A plane figure, bounded by a single curve line called its
        circumference, every part of which is equally distant from
        a point within it, called the center.
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     2. The line that bounds such a figure; a circumference; a
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     3. (Astron.) An instrument of observation, the graduated limb
        of which consists of an entire circle.
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     Note: When it is fixed to a wall in an observatory, it is
           called a mural circle; when mounted with a telescope
           on an axis and in Y's, in the plane of the meridian, a
           meridian circle or transit circle; when involving
           the principle of reflection, like the sextant, a
           reflecting circle; and when that of repeating an
           angle several times continuously along the graduated
           limb, a repeating circle.
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     4. A round body; a sphere; an orb.
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              It is he that sitteth upon the circle of the earth.
                                                    --Is. xi. 22.
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     5. Compass; circuit; inclosure.
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              In the circle of this forest.         --Shak.
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     6. A company assembled, or conceived to assemble, about a
        central point of interest, or bound by a common tie; a
        class or division of society; a coterie; a set.
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              As his name gradually became known, the circle of
              his acquaintance widened.             --Macaulay.
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     7. A circular group of persons; a ring.
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     8. A series ending where it begins, and repeating itself.
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              Thus in a circle runs the peasant's pain. --Dryden.
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     9. (Logic) A form of argument in which two or more unproved
        statements are used to prove each other; inconclusive
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              That heavy bodies descend by gravity; and, again,
              that gravity is a quality whereby a heavy body
              descends, is an impertinent circle and teaches
              nothing.                              --Glanvill.
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     10. Indirect form of words; circumlocution. [R.]
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               Has he given the lie,
               In circle, or oblique, or semicircle. --J.
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     11. A territorial division or district.
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     The Circles of the Holy Roman Empire, ten in number, were
        those principalities or provinces which had seats in the
        German Diet.
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     Azimuth circle. See under Azimuth.
     Circle of altitude (Astron.), a circle parallel to the
        horizon, having its pole in the zenith; an almucantar.
     Circle of curvature. See Osculating circle of a curve
     Circle of declination. See under Declination.
     Circle of latitude.
         (a) (Astron.) A great circle perpendicular to the plane
             of the ecliptic, passing through its poles.
         (b) (Spherical Projection) A small circle of the sphere
             whose plane is perpendicular to the axis.
     Circles of longitude, lesser circles parallel to the
        ecliptic, diminishing as they recede from it.
     Circle of perpetual apparition, at any given place, the
        boundary of that space around the elevated pole, within
        which the stars never set. Its distance from the pole is
        equal to the latitude of the place.
     Circle of perpetual occultation, at any given place, the
        boundary of the space around the depressed pole, within
        which the stars never rise.
     Circle of the sphere, a circle upon the surface of the
        sphere, called a great circle when its plane passes
        through the center of the sphere; in all other cases, a
        small circle.
     Diurnal circle. See under Diurnal.
     Dress circle, a gallery in a theater, generally the one
        containing the prominent and more expensive seats.
     Druidical circles (Eng. Antiq.), a popular name for certain
        ancient inclosures formed by rude stones circularly
        arranged, as at Stonehenge, near Salisbury.
     Family circle, a gallery in a theater, usually one
        containing inexpensive seats.
     Horary circles (Dialing), the lines on dials which show the
     Osculating circle of a curve (Geom.), the circle which
        touches the curve at some point in the curve, and close to
        the point more nearly coincides with the curve than any
        other circle. This circle is used as a measure of the
        curvature of the curve at the point, and hence is called
        circle of curvature.
     Pitch circle. See under Pitch.
     Vertical circle, an azimuth circle.
     Voltaic circuit or Voltaic circle. See under Circuit.
     To square the circle. See under Square.
     Syn: Ring; circlet; compass; circuit; inclosure.
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