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lation 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,…

A circumferentor. See Circumferentor.

A point upon the surface of a sphere equally distant from every part of the circumference of a great circle; or the point in which a diameter of the sphere perpendicular to the plane of such circle meets the surface. Such a point is called the pole of that circle; as, the pole of the horizon; the pole of the ecliptic;…

The quarter of a circle, or of the circumference of a circle, an arc of 90º, or one subtending a right angle at the center.

The plane figure included between the circumferences of two concentric circles.

A large, stout cord, usually one not less than an inch in circumference, made of strands twisted or braided together. It differs from cord, line, and string, only in its size. See Cordage.

Having every portion of the surface or of the circumference equally distant from the center; spherical; circular; having a form approaching a spherical or a circular shape; orbicular; globular; as, a round ball. "The big, round tears." Shak. Upon the firm opacous globe Of this round world. Milton.

ver. -- Scoop wheel, a wheel for raising water, having scoops or buckets attached to its circumference; a tympanum.

The half of a circle; the part of a circle bounded by its diameter and half of its circumference.

a right line, drawn from the center of a circle, a sphere, or other curved figure, to its circumference or periphery; a radius.

lands of a land district. [U.S.] Davies & Peck (Math. Dict.). -- Surveyor's compass. See Circumferentor. -- Surveyor's level. See under Level.

he earth is a terraqueous globe. Cudworth. The grand terraqueous spectacle From center to circumference unveiled. Wordsworth.

A ring of thin metal formed with a grooved circumference so as to fit within an eye-spice, or the like, and protect it from chafing.

A hoop or band, as of metal, on the circumference of the wheel of a vehicle, to impart strength and receive the wear.

Denticete. -- Toothed wheel, a wheel with teeth or projections cut or set on its edge or circumference, for transmitting motion by their action on the engaging teeth of another wheel.

The part of a cut gem between the girdle, or circumference, and the table, or flat upper surface. Knight.

The surface described by the circumference of a circle revolving about a straight line in its own plane.

-- Tub wheel, a horizontal water wheel, usually in the form of a short cylinder, to the circumference of which spiral vanes or floats, placed radially, are attached, turned by the impact of one or more streams of water, conducted so as to strike against the floats in the direction of a tangent to the cylinder.…

Having the circumference of a tun. [Obs.] Chaucer.

s by which water is raised to the axis when the wheel revolves with the lower part of the circumference submerged, -- used for raising water, as for irrigation.