See also:post or stake of some considerable length, used as a support in scaffolding, for telegraph or telephone wires, hops, &c., and as a means for taking jumps (see
See also:POLE-VAULTING), and also as a single
See also:shaft for a vehicle
See also:drawn by two or more horses . As a measure of length a " pole," also called "
See also:rod " or "
See also:perch," is equal to 51 yds . (16 ft.), as a measure of
See also:area it is equal to 30; sq. yds . (2) (
See also:Lat. polus, adapted from Gr . 1roXos,
See also:axis), one or other of the extremities of the axis of the
See also:earth; the "
See also:celestial pole " is one or other of the points in the heavens to which the earth's axis points; in the
See also:northern hemisphere this point is near the
See also:star Ursae minoris, better known as the Pole-star or Polaris (see URSA MAJOR) . For the regions lying about the
See also:north and south poles of the earth see POLAR REGIONS . In
See also:mathematics the word pole has several meanings . In spherical trigonometry the " pole " of a circle on a sphere is the point where the diameter of the sphere perpendicular to the
See also:plane of the circle intersects the sphere . In crystallography (q.v.) the " pole " of a
See also:face is the intersection of a
See also:line perpendicular to the face with the sphere of
See also:projection . The
See also:term is also applied to a point from which lines radiate, as, for instance, the origin in a
See also:system of polar co-ordinates, or the
See also:common point of a pencil of rays . In the
See also:geometry of conic sections the " pole " of a line, termed the " polar " of the point, is the intersection of the tangents (either real or imaginary) at the points where the line meets the conic (see GEOMETRY: § Projective) . The " magnetic poles " of the earth are the points on the earth's
See also:surface where the dipping
See also:needle is vertical (see TERRESTRIAL MAGNETISM) ; and the " poles " of a magnet are the points of the magnet where the magnetic intensity is greatest .
See also:electricity, the term is applied to the elements of a galvanic battery (q.v.), or to the terminals of a frictional electrical machine .
POLICE (Fr. police, government, civil administratio...
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