METER-IN--To regulate the amount of fluid into a
MAGNETIC FLUX--A general term used to
system or an actuator.
designate collectively all the electric or magnetic
lines of force in a region.
METER-OUT--To regulate the flow of fluid from a
system or actuator.
MAGNETIC POLE--Focus of magnetic lines of
force entering or emanating from magnet.
METERING ROD--A small rod, having a varied
diameter, operated within a jet to vary the flow of
MAGNETISM--The property exhibited by certain
fuel through the jet.
substances and produced by electron motion,
which results in the attraction of iron and steel.
MICRON--A millionth of a meter or about 0.00004
MAGNETO--A device that generates voltage surges,
transforms them to high-voltage surges, and
MODULATOR--A pressure control or adjusting
distributes them to the engine cylinder spark plugs.
valve used in hydraulic systems of automatic trans-
MAGNET--Any body that has the ability to attract
MOLECULE--A small natural particle of matter
composed of two or more atoms.
MAIN BEARING--In an engine, the bearings that
support the crankshaft.
MOTOR, ELECTRIC--A device for converting
electrical energy into mechanical energy.
MANIFOLD--(1) A type of fluid conductor that
provides multiple connections ports. (2) See
MOTOR, FIXED-DISPLACEMENT--A motor in
also INTAKE MANIFOLD OR EXHAUST
which the displacement per unit of output motion
cannot be varied.
MANOMETER--A differential pressure gauge in
MOTOR, HYDRAULIC--A device that converts
which pressure is indicated by the height of a liquid
fluid power into mechanical force and motion. It
column of known density. Pressure is equal to the
usually provides rotary mechanical motion.
difference in vertical height between two
MOTOR, LINEAR--(See CYLINDER.)
connected columns multiplied by the density of the
MOTOR, ROTARY--A motor capable of continuous
U tube, inclined tube, well, and bell types.
MASTER CYLINDER--In a hydraulic brake system,
MOTOR, ROTARY LIMITED--A rotary motor hav-
the liquid-filled cylinder in which hydraulic
ing limited motion.
pressure is developed by depressing the brake
MOTOR, VARIABLE-DISPLACEMENT--A motor
in which the displacement per unit of output motion
MATTER--Anything that has weight and occupies
can be varied.
MECHANICAL ADVANTAGE--The ratio of the
which the exhaust gases must pass and which
resisting weight to the acting force. The ratio of the
greatly reduces the exhaust sounds.
distance through which the force is exerted divided
by the distance the weight is raised.
more than one circuit, as two coils, one of which
MECHANICAL EFFICIENCY--In an engine, the
induces current in the other as the current in the first
NEEDLE BEARING--An antifriction roller-type
MECHANISM--A system of parts or appliances that
bearing in which the rollers have a very narrow
acts as a working agency to achieve a desired result.
diameter in relation to their length.
MEMBER--Any essential part of a machine or
NEEDLE VA LV E -- A t y p e o f v a l v e w i t h a
rod-shaped, needle-pointed valving element body
that works into a valve seat so shaped that the
MESHING--The mating or engaging of the teeth of
needle point fits into it and closes the passage. The