Found 1 items, similar to Visual angle.
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Definition: Visual angle
, a. [L. visualis, from visus a seeing, sight:
cf. F. visuel. See Vision
1. Of or pertaining to sight; used in sight; serving as the
instrument of seeing; as, the visual nerve.
Nowhere so clear, sharpened his visual ray.
2. That can be seen; visible. [R.]
. (Opt.) See under Angle
(Persp.), a cone whose vertex is at the point
of sight, or the eye.
, any plane passing through the point of sight.
, the point at which the visual rays unite; the
position of the eye.
(Physiol.), a photochemical substance, of a
purplish red color, contained in the retina of human eyes
and in the eyes of most animals. It is quickly bleached by
light, passing through the colors, red, orange, and
yellow, and then disappearing. Also called rhodopsin
and vision purple
. See Optography
, a line from the eye, or point of sight.
(Physiol.), the final product in the action of
light on visual purple. It is reconverted into visual
purple by the regenerating action of the choroidal
(Physiol.), a product intermediate between
visual purple and visual white, formed in the
photochemical action of light on visual purple.
([a^][ng]"g'l), n. [F. angle, L. angulus angle,
corner; akin to uncus hook, Gr. 'agky`los bent, crooked,
angular, 'a`gkos a bend or hollow, AS. angel hook, fish-hook,
G. angel, and F. anchor.]
1. The inclosed space near the point where two lines meet; a
corner; a nook.
Into the utmost angle of the world. --Spenser.
To search the tenderest angles of the heart.
(a) The figure made by. two lines which meet.
(b) The difference of direction of two lines. In the lines
meet, the point of meeting is the vertex of the angle.
3. A projecting or sharp corner; an angular fragment.
Though but an angle reached him of the stone.
4. (Astrol.) A name given to four of the twelve astrological
5. [AS. angel.] A fishhook; tackle for catching fish,
consisting of a line, hook, and bait, with or without a
Give me mine angle: we 'll to the river there.
A fisher next his trembling angle bears. --Pope.
, one less than a right angle, or less than
or Contiguous angles
, such as have one leg
common to both angles.
. See Alternate
(a) (Carp.) An upright bar at the angle where two faces of
a polygonal or bay window meet. --Knight.
(b) (Mach.) Same as Angle iron
(Arch.), a bead worked on or fixed to the angle
of any architectural work, esp. for protecting an angle of
, Angle tie
(Carp.), a brace across an
interior angle of a wooden frame, forming the hypothenuse
and securing the two side pieces together. --Knight.
(Mach.), a rolled bar or plate of iron having
one or more angles, used for forming the corners, or
connecting or sustaining the sides of an iron structure to
which it is riveted.
(Arch.), a detail in the form of a leaf, more or
less conventionalized, used to decorate and sometimes to
strengthen an angle.
, an instrument for measuring angles, esp. for
ascertaining the dip of strata.
(Arch.), an enriched angle bead, often having a
capital or base, or both.
, one formed by two curved lines.
, angles formed by the sides of any
right-lined figure, when the sides are produced or
. See under Facial
, those which are within any right-lined
, one formed by a right line with a curved
, one acute or obtuse, in opposition to a
, one greater than a right angle, or more than
. See under Optic
or Right-lined angle
, one formed by two right
, one formed by a right line falling on another
perpendicularly, or an angle of 90[deg] (measured by a
, the figure formed by the meeting of three or
more plane angles at one point.
, one made by the meeting of two arcs of
great circles, which mutually cut one another on the
surface of a globe or sphere.
, the angle formed by two rays of light, or two
straight lines drawn from the extreme points of an object
to the center of the eye.
For Angles of commutation