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apparent diameter 4. Greatness; grandeur. ``With plain, heroic magnitude of
mind.' --Milton.
5. Greatness, in reference to influence or effect;
importance; as, an affair of magnitude.
The magnitude of his designs. --Bp. Horsley.
Apparent magnitude (Opt.), the angular breadth of an object
viewed as measured by the angle which it subtends at the
eye of the observer; -- called also apparent diameter.
Magnitude of a star (Astron.), the rank of a star with
respect to brightness. About twenty very bright stars are
said to be of first magnitude, the stars of the sixth
magnitude being just visible to the naked eye. Telescopic
stars are classified down to the twelfth magnitude or
lower. The scale of the magnitudes is quite arbitrary, but
by means of photometers, the classification has been made
to tenths of a magnitude. Conjugate diametersDiameter Di*am"e*ter, n. [F. diam[`e]tre, L. diametros, fr.
Gr. ?; dia` through + ? measure. See Meter.]
1. (Geom.)
(a) Any right line passing through the center of a figure
or body, as a circle, conic section, sphere, cube,
etc., and terminated by the opposite boundaries; a
straight line which bisects a system of parallel
chords drawn in a curve.
(b) A diametral plane.
2. The length of a straight line through the center of an
object from side to side; width; thickness; as, the
diameter of a tree or rock.
Note: In an elongated object the diameter is usually taken at
right angles to the longer axis.
3. (Arch.) The distance through the lower part of the shaft
of a column, used as a standard measure for all parts of
the order. See Module.
Conjugate diameters. See under Conjugate. Conjugate diametersConjugate Con"ju*gate, a. [L. conjugatus, p. p. or conjugare
to unite; con- + jugare to join, yoke, marry, jugum yoke;
akin to jungere to join. See Join.]
1. United in pairs; yoked together; coupled.
2. (Bot.) In single pairs; coupled.
3. (Chem.) Containing two or more radicals supposed to act
the part of a single one. [R.]
4. (Gram.) Agreeing in derivation and radical signification;
-- said of words.
5. (Math.) Presenting themselves simultaneously and having
reciprocal properties; -- frequently used in pure and
applied mathematics with reference to two quantities,
points, lines, axes, curves, etc.
Conjugate axis of a hyperbola (Math.), the line through the
center of the curve, perpendicular to the line through the
two foci.
Conjugate diameters (Conic Sections), two diameters of an
ellipse or hyperbola such that each bisects all chords
drawn parallel to the other.
Conjugate focus (Opt.) See under Focus.
Conjugate mirrors (Optics), two mirrors so placed that rays
from the focus of one are received at the focus of the
other, especially two concave mirrors so placed that rays
proceeding from the principal focus of one and reflected
in a parallel beam are received upon the other and brought
to the principal focus.
Conjugate point (Geom.), an acnode. See Acnode, and
Double point.
Self-conjugate triangle (Conic Sections), a triangle each
of whose vertices is the pole of the opposite side with
reference to a conic. DiameterDiameter Di*am"e*ter, n. [F. diam[`e]tre, L. diametros, fr.
Gr. ?; dia` through + ? measure. See Meter.]
1. (Geom.)
(a) Any right line passing through the center of a figure
or body, as a circle, conic section, sphere, cube,
etc., and terminated by the opposite boundaries; a
straight line which bisects a system of parallel
chords drawn in a curve.
(b) A diametral plane.
2. The length of a straight line through the center of an
object from side to side; width; thickness; as, the
diameter of a tree or rock.
Note: In an elongated object the diameter is usually taken at
right angles to the longer axis.
3. (Arch.) The distance through the lower part of the shaft
of a column, used as a standard measure for all parts of
the order. See Module.
Conjugate diameters. See under Conjugate. Diametral
Diametral Di*am"e*tral, n.
A diameter. [Obs.] --Sir T. Browne.
Diametral pitchPitch Pitch, n.
1. A throw; a toss; a cast, as of something from the hand;
as, a good pitch in quoits.
Pitch and toss, a game played by tossing up a coin, and
calling ``Heads or tails;' hence:
To play pitch and toss with (anything), to be careless or
trust to luck about it. ``To play pitch and toss with the
property of the country.' --G. Eliot.
Pitch farthing. See Chuck farthing, under 5th Chuck.
2. (Cricket) That point of the ground on which the ball
pitches or lights when bowled.
3. A point or peak; the extreme point or degree of elevation
or depression; hence, a limit or bound.
Driven headlong from the pitch of heaven, down Into
this deep. --Milton.
Enterprises of great pitch and moment. --Shak.
To lowest pitch of abject fortune. --Milton.
He lived when learning was at its highest pitch.
--Addison.
The exact pitch, or limits, where temperance ends.
--Sharp.
4. Height; stature. [Obs.] --Hudibras.
5. A descent; a fall; a thrusting down.
6. The point where a declivity begins; hence, the declivity
itself; a descending slope; the degree or rate of descent
or slope; slant; as, a steep pitch in the road; the pitch
of a roof.
7. (Mus.) The relative acuteness or gravity of a tone,
determined by the number of vibrations which produce it;
the place of any tone upon a scale of high and low.
Note: Musical tones with reference to absolute pitch, are
named after the first seven letters of the alphabet;
with reference to relative pitch, in a series of tones
called the scale, they are called one, two, three,
four, five, six, seven, eight. Eight is also one of a
new scale an octave higher, as one is eight of a scale
an octave lower.
8. (Mining) The limit of ground set to a miner who receives a
share of the ore taken out.
9. (Mech.)
(a) The distance from center to center of any two adjacent
teeth of gearing, measured on the pitch line; --
called also circular pitch.
(b) The length, measured along the axis, of a complete
turn of the thread of a screw, or of the helical lines
of the blades of a screw propeller.
(c) The distance between the centers of holes, as of rivet
holes in boiler plates.
Concert pitch (Mus.), the standard of pitch used by
orchestras, as in concerts, etc.
Diametral pitch (Gearing), the distance which bears the
same relation 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, as one made of metallic plates,
adapted for working with a sprocket wheel.
Pitch line, or Pitch circle (Gearing), an ideal line, in
a toothed gear or rack, bearing such a relation to a
corresponding line in another gear, with which the former
works, that the two lines will have a common velocity as
in rolling contact; it usually cuts the teeth at about the
middle of their height, and, in a circular gear, is a
circle concentric with the axis of the gear; the line, or
circle, on which the pitch of teeth is measured.
Pitch of a roof (Arch.), the inclination or slope of the
sides expressed by the height in parts of the span; as,
one half pitch; whole pitch; or by the height in parts of
the half span, especially among engineers; or by degrees,
as a pitch of 30[deg], of 45[deg], etc.; or by the rise
and run, that is, the ratio of the height to the half
span; as, a pitch of six rise to ten run. Equilateral
pitch is where the two sloping sides with the span form an
equilateral triangle.
Pitch of a plane (Carp.), the slant of the cutting iron.
Pitch pipe, a wind instrument used by choristers in
regulating the pitch of a tune.
Pitch point (Gearing), the point of contact of the pitch
lines of two gears, or of a rack and pinion, which work
together. Diametrally
Diametrally Di*am"e*tral*ly, adv.
Diametrically.
Diametric
Diametric Di*am"e*tric, Diametrical Di*am"e*tric*al, a.
1. Of or pertaining to a diameter.
2. As remote as possible, as if at the opposite end of a
diameter; directly adverse.
Diametrical
Diametric Di*am"e*tric, Diametrical Di*am"e*tric*al, a.
1. Of or pertaining to a diameter.
2. As remote as possible, as if at the opposite end of a
diameter; directly adverse.
Diametrically
Diametrically Di*am"e*tric*al*ly, adv.
In a diametrical manner; directly; as, diametrically
opposite.
Whose principles were diametrically opposed to his.
--Macaulay.
Isodiametric
Isodiametric I`so*di`a*met"ric, a. [Iso- + diametric.]
1. (Crystallog.) Developed alike in the directions of the
several lateral axes; -- said of crystals of both the
tetragonal and hexagonal systems.
2. (Bot.) Having the several diameters nearly equal; -- said
of the cells of ordinary parenchyma.
Semidiameter
Semidiameter Sem`i*di*am"e*ter, n. (Math.)
Half of a diameter; a right line, or the length of a right
line, drawn from the center of a circle, a sphere, or other
curved figure, to its circumference or periphery; a radius.
Meaning of Diamet from wikipedia
