I know not you; nor am I well pleased to make this
time, as the affair now stands, the induction of
your acquaintance. --Beau. & Fl.
These promises are fair, the parties sure, And our
induction dull of prosperous hope. --Shak.
2. An introduction or introductory scene, as to a play; a
preface; a prologue. [Obs.]
This is but an induction: I will d?aw The curtains
of the tragedy hereafter. --Massinger.
3. (Philos.) The act or process of reasoning from a part to a
whole, from particulars to generals, or from the
individual to the universal; also, the result or inference
so reached.
Induction is an inference drawn from all the
particulars. --Sir W.
Hamilton.
Induction is the process by which we conclude that
what is true of certain individuals of a class, is
true of the whole class, or that what is true at
certain times will be true in similar circumstances
at all times. --J. S. Mill.
4. The introduction of a clergyman into a benefice, or of an
official into a office, with appropriate acts or
ceremonies; the giving actual possession of an
ecclesiastical living or its temporalities.
5. (Math.) A process of demonstration in which a general
truth is gathered from an examination of particular cases,
one of which is known to be true, the examination being so
conducted that each case is made to depend on the
preceding one; -- called also {successive induction}.
6. (Physics) The property by which one body, having
electrical or magnetic polarity, causes or induces it in
another body without direct contact; an impress of
electrical or magnetic force or condition from one body on
another without actual contact.
{Electro-dynamic induction}, the action by which a variable
or interrupted current of electricity excites another
current in a neighboring conductor forming a closed
circuit.
{Electro-magnetic induction}, the influence by which an
electric current produces magnetic polarity in certain
bodies near or around which it passes.
{Electro-static induction}, the action by which a body
possessing a charge of statical electricity develops a
charge of statical electricity of the opposite character
in a neighboring body.
{Induction coil}, an apparatus producing induced currents of
great intensity. It consists of a coil or helix of stout
insulated copper wire, surrounded by another coil of very
fine insulated wire, in which a momentary current is
induced, when a current (as from a voltaic battery),
passing through the inner coil, is made, broken, or
varied. The inner coil has within it a core of soft iron,
and is connected at its terminals with a condenser; --
called also {inductorium}, and {Ruhmkorff's coil}.
{Induction pipe}, {port}, or {valve}, a pipe, passageway, or
valve, for leading or admitting a fluid to a receiver, as
steam to an engine cylinder, or water to a pump.
{Magnetic induction}, the action by which magnetic polarity
is developed in a body susceptible to magnetic effects
when brought under the influence of a magnet.
{Magneto-electric induction}, the influence by which a magnet
excites electric currents in closed circuits.
{Logical induction}, (Philos.), an act or method of reasoning
from all the parts separately to the whole which they
constitute, or into which they may be united collectively;
the operation of discovering and proving general
propositions; the scientific method.
{Philosophical induction}, the inference, or the act of
inferring, that what has been observed or established in
respect to a part, individual, or species, may, on the
ground of analogy, be affirmed or received of the whole to
which it belongs. This last is the inductive method of
Bacon. It ascends from the parts to the whole, and forms,
from the general analogy of nature, or special
presumptions in the case, conclusions which have greater
or less degrees of force, and which may be strengthened or
weakened by subsequent experience and experiment. It
relates to actual existences, as in physical science or
the concerns of life. Logical induction is founded on the
necessary laws of thought; philosophical induction, on the
interpretation of the indications or analogy of nature.
Swift through the valves the visionary fair
Repassed. --Pope.
Heavily closed, . . . the valves of the barn doors.
--Longfellow.
2. A lid, plug, or cover, applied to an aperture so that by
its movement, as by swinging, lifting and falling,
sliding, turning, or the like, it will open or close the
aperture to permit or prevent passage, as of a fluid.
Note: A valve may act automatically so as to be opened by the
effort of a fluid to pass in one direction, and closed
by the effort to pass in the other direction, as a
clack valve; or it may be opened or closed by hand or
by mechanism, as a screw valve, or a slide valve.
3. (Anat.) One or more membranous partitions, flaps, or
folds, which permit the passage of the contents of a
vessel or cavity in one direction, but stop or retard the
flow in the opposite direction; as, the ileocolic, mitral,
and semilunar valves.
4. (Bot.)
(a) One of the pieces into which a capsule naturally
separates when it bursts.
(b) One of the two similar portions of the shell of a
diatom.
(c) A small portion of certain anthers, which opens like a
trapdoor to allow the pollen to escape, as in the
barberry.
5. (Zo["o]l.) One of the pieces or divisions of bivalve or
multivalve shells.
{Air valve}, {Ball valve}, {Check valve}, etc. See under
{Air}. {Ball}, {Check}, etc.
{Double-beat valve}, a kind of balance valve usually
consisting of a movable, open-ended, turban-shaped shell
provided with two faces of nearly equal diameters, one
above another, which rest upon two corresponding seats
when the valve is closed.
{Equilibrium valve}.
(a) A balance valve. See under {Balance}.
(b) A valve for permitting air, steam, water, etc., to
pass into or out of a chamber so as to establish or
maintain equal pressure within and without.
{Valve chest} (Mach.), a chamber in which a valve works;
especially (Steam Engine), the steam chest; -- called in
England {valve box}, and {valve casing}. See {Steam
chest}, under {Steam}.
{Valve face} (Mach.), that part of the surface of a valve
which comes in contact with the {valve seat}.
{Valve gear}, or {Valve motion} (Steam Engine), the system of
parts by which motion is given to the valve or valves for
the distribution of steam in the cylinder. For an
illustration of one form of valve gear, see {Link motion}.
{Valve seat}. (Mach.)
(a) The fixed surface on which a valve rests or against
which it presses.
(b) A part or piece on which such a surface is formed.
{Valve stem} (Mach.), a rod attached to a valve, for moving
it.
{Valve yoke} (Mach.), a strap embracing a slide valve and
connecting it to the valve stem.