Found 2 items, similar to Conical projection.
English → English
Definition: conical projection
n : a map projection of the globe onto a cone with its point
over one of the earth's poles [syn: conic projection
English → English
Definition: Conical projection
, Conical \Con"ic*al\
, a. [Gr. ?: cf. F. conique.
1. Having the form of, or resembling, a geometrical cone;
round and tapering to a point, or gradually lessening in
circumference; as, a conic or conical figure; a conical
2. Of or pertaining to a cone; as, conic sections.
(Geom.), a curved line formed by the
intersection of the surface of a right cone and a plane.
The conic sections are the parabola, ellipse, and
hyperbola. The right lines and the circle which result
from certain positions of the plane are sometimes, though
not generally included.
, that branch of geometry which treats of the
parabola, ellipse, and hyperbola.
. See Pendulum
, a method of delineating the surface of
a sphere upon a plane surface as if projected upon the
surface of a cone; -- much used by makers of maps in
(Geom.), a surface described by a right
line moving along any curve and always passing through a
fixed point that is not in the plane of that curve.
, n. [L. projectio: cf. F. projection.]
1. The act of throwing or shooting forward.
2. A jutting out; also, a part jutting out, as of a building;
an extension beyond something else.
3. The act of scheming or planning; also, that which is
planned; contrivance; design; plan. --Davenant.
4. (Persp.) The representation of something; delineation;
plan; especially, the representation of any object on a
perspective plane, or such a delineation as would result
were the chief points of the object thrown forward upon
the plane, each in the direction of a line drawn through
it from a given point of sight, or central point; as, the
projection of a sphere. The several kinds of projection
differ according to the assumed point of sight and plane
of projection in each.
5. (Geog.) Any method of representing the surface of the
earth upon a plane.
, a mode of representing the sphere, the
spherical surface being projected upon the surface of a
cone tangent to the sphere, the point of sight being at
the center of the sphere.
, a mode of representing the sphere,
the spherical surface being projected upon the surface of
a cylinder touching the sphere, the point of sight being
at the center of the sphere.
, a mode of representing the sphere in
which the meridians are drawn parallel to each other, and
the parallels of latitude are straight lines whose
distance from each other increases with their distance
from the equator, so that at all places the degrees of
latitude and longitude have to each other the same ratio
as on the sphere itself.
, a projection made by parallel lines
drawn from every point of a figure and meeting the plane
of projection obliquely.
, a projection of the sphere in which the
point of sight is at the center, and the plane of
projection passes through one of the polar circles.
Powder of projection
(Alchemy.), a certain powder cast into
a crucible or other vessel containing prepared metal or
other matter which is to be thereby transmuted into gold.
Projection of a point on a plane
(Descriptive Geom.), the
foot of a perpendicular to the plane drawn through the
Projection of a straight line of a plane
, the straight line
of the plane connecting the feet of the perpendiculars let
fall from the extremities of the given line.
Syn: See Protuberance