磁化曲线幅值
天体出没磁方位角

Magnetic \Mag*net"ic\, Magnetical \Mag*net"ic*al\, a. [L.
magneticus: cf. F. magn['e]tique.]
1. Pertaining to the magnet; possessing the properties of the
magnet, or corresponding properties; as, a magnetic bar of
iron; a magnetic needle.

2. Of or pertaining to, or characterized by, the earth's
magnetism; as, the magnetic north; the magnetic meridian.

3. Capable of becoming a magnet; susceptible to magnetism;
as, the magnetic metals.

4. Endowed with extraordinary personal power to excite the
feelings and to win the affections; attractive; inducing
attachment.

She that had all magnetic force alone. --Donne.

5. Having, susceptible to, or induced by, animal magnetism,
so called; hypnotic; as, a magnetic sleep. See
{Magnetism}. [Archaic]
[1913 Webster +PJC]

{Magnetic amplitude}, {attraction}, {dip}, {induction}, etc.
See under {Amplitude}, {Attraction}, etc.

{Magnetic battery}, a combination of bar or horseshoe magnets
with the like poles adjacent, so as to act together with
great power.

{Magnetic compensator}, a contrivance connected with a ship's
compass for compensating or neutralizing the effect of the
iron of the ship upon the needle.

{Magnetic curves}, curves indicating lines of magnetic force,
as in the arrangement of iron filings between the poles of
a powerful magnet.

{Magnetic elements}.
(a) (Chem. Physics) Those elements, as iron, nickel,
cobalt, chromium, manganese, etc., which are capable
or becoming magnetic.
(b) (Physics) In respect to terrestrial magnetism, the
declination, inclination, and intensity.
(c) See under {Element}.

{Magnetic fluid}, the hypothetical fluid whose existence was
formerly assumed in the explanations of the phenomena of
magnetism; -- no longer considered a meaningful concept.


{Magnetic iron}, or {Magnetic iron ore}. (Min.) Same as
{Magnetite}.

{Magnetic needle}, a slender bar of steel, magnetized and
suspended at its center on a sharp-pointed pivot, or by a
delicate fiber, so that it may take freely the direction
of the magnetic meridian. It constitutes the essential
part of a compass, such as the mariner's and the
surveyor's.

{Magnetic poles}, the two points in the opposite polar
regions of the earth at which the direction of the dipping
needle is vertical.

{Magnetic pyrites}. See {Pyrrhotite}.

{Magnetic storm} (Terrestrial Physics), a disturbance of the
earth's magnetic force characterized by great and sudden
changes.

{Magnetic telegraph}, a telegraph acting by means of a
magnet. See {Telegraph}.


Amplitude \Am"pli*tude\, n. [L. amplitudo, fr. amplus: cf. F.
amplitude. See {Ample}.]
1. State of being ample; extent of surface or space;
largeness of dimensions; size.

The cathedral of Lincoln . . . is a magnificent
structure, proportionable to the amplitude of the
diocese. --Fuller.

2. Largeness, in a figurative sense; breadth; abundance;
fullness.
(a) Of extent of capacity or intellectual powers.
``Amplitude of mind.'' --Milton. ``Amplitude of
comprehension.'' --Macaulay.
(b) Of extent of means or resources. ``Amplitude of
reward.'' --Bacon.

3. (Astron.)
(a) The arc of the horizon between the true east or west
point and the center of the sun, or a star, at its
rising or setting. At the rising, the amplitude is
eastern or ortive: at the setting, it is western,
occiduous, or occasive. It is also northern or
southern, when north or south of the equator.
(b) The arc of the horizon between the true east or west
point and the foot of the vertical circle passing
through any star or object.

4. (Gun.) The horizontal line which measures the distance to
which a projectile is thrown; the range.

5. (Physics) The extent of a movement measured from the
starting point or position of equilibrium; -- applied
especially to vibratory movements.

6. (math.) An angle upon which the value of some function
depends; -- a term used more especially in connection with
elliptic functions.

{Magnetic amplitude}, the angular distance of a heavenly
body, when on the horizon, from the magnetic east or west
point as indicated by the compass. The difference between
the magnetic and the true or astronomical amplitude (see 3
above) is the ``variation of the compass.''