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A method of cw keying using punched tape or other mechanical means to key a
See BALANCED MIXER .
A combination of H-type and E-type T-junctions .
Wire coated with an enamel insulation and used in coils, relays, transformers, motor windings, and so forth .
An electromagnetic device that uses one or more saturable reactors to obtain
a large power gain. This device is used in servosystems requiring large amounts of power to move heavy loads  .
(1) The region in which the magnetic forces created by a permanent magnet or by a current-carrying conductor or coil can be detected  . (2) The field that is produced when current flows through a conductor or antenna  .
MAGNETIC LINES OF FORCE
Imaginary lines used for convenience to designate the direction in which magnetic forces are acting as a result of magnetomotive force .
A microphone in which the sound waves vibrate a moving armature. The
armature consists of a coil wound on the armature and located between the pole pieces of a permanent magnet. The armature is mechanically linked to the diaphragm .
The section of a magnet where the flux lines are concentrated; also where they
enter and leave the magnet .