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The chestnut tree. [Obs.] Wilwe, elm, plane, assch, box, chesteyn. Chaucer.

A plane figure of a thousand angles and sides. Barlow.

A figure bounded by a thousand plane surfaces [Spelt also chiliaëdron.]

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.

ity (Geom.), two imaginary points at infinite distance through which every circle in the plane is, in the theory of curves, imagined to pass. -- Circular polarization. (Min.) See under Polarization. -- Circular or Globular sailing (Naut.), the method of sailing by the arc of a great circle. -- Circular saw. See unde…

One of the moons or satellites of the planet Jupiter. [Obs.] Derham.

he purpose of solving two celebrated problems of the higher geometry; viz., to trisect a plane angle, and to construct two geometrical means between two given straight lines.

tion is a minimum, affording more or less smooth surfaces; the direction of the dividing plane; a fragment obtained by cleaving, as of a diamond. See Parting.

f projection in drawing in which the rays of light are supposed to fall obliquely on the plane of projection.

The plane in crystals of the monoclinic system which is parallel to the vertical and the inclined lateral (clinidiagonal) axes.

An apparatus used in controlling certain kinds of aëroplanes, and consisting principally of a steering column mounted with a universal joint at the base, which is bellshaped and has attached to it the cables for controlling the wing-warping devices, elevator planes, and the like.

of a clock; -- said of that direction of a rotation about an axis, or about a point in a plane, which is ordinarily reckoned negative.

eneral proposition, as when Kepler discovered that the various observed positions of the planet Mars were points in an ellipse. "The colligation of facts." Whewell. Colligation is not always induction, but induction is always colligation. J. S. Mill.

So near the sun as to be obscured or eclipsed by his light, as the moon or planets when not more than eight degrees and a half from the sun. [Obs.] Planets that are oft combust. Milton.

ice, hotel, or the like. The commissionaire familiar to European travelers performs miscellaneous services as a light porter, messenger, solicitor for hotels, etc.

One of a class of attendants, in some European cities, who perform miscellaneous services for travelers.

e of commutation (Astron.), the difference of the geocentric longitudes of the sun and a planet. -- Commutation of tithes, the substitution of a regular payment, chargeable to the land, for the annual tithes in kind. -- Commutation ticket, a ticket, as for transportation, which is the evidence of a contract for servi…

l, a small pocket compass fitted with a sundial to tell the hour of the day. -- Compass plane (Carp.), a plane, convex in the direction of its length on the under side, for smoothing the concave faces of curved woodwork. -- Compass plant, Compass flower (Bot.), a plant of the American prairies (Silphium laciniatum),…

ed, an agreement for composition between a debtor and several creditors. -- Composition plane (Crystallog.), the plane by which the two individuals of a twin crystal are united in their reserved positions. -- Composition of forces (Mech.), the finding of a single force (called the resultant) which shall be equal in e…

Condensed; compact; dense. [R.] The huge condense bodies of planets. Bentley.