MODULATION, OVER.--See Blub Blub.
MODULATION, PLATE.--Modulating the oscillations set up by a vacuum tube by varying the current impressed on the plate.
MODULATOR TUBE.--A vacuum tube used as a modulator.
MOTION, WAVE.--(1) The to and fro motion of water at sea. (2) Waves transmitted by, in and through the air, or sound waves. (3) Waves transmitted by, in and through the ether, or electromagnetic waves, or electric waves for short.
MOTOR-GENERATOR.--A motor and a dynamo built to run at the same speed and mounted on a common base, the shafts being coupled together. In wireless it is used for changing commercial direct current into direct current of higher voltages for energizing the plate of a vacuum tube oscillator.
MULTI-STAGE AMPLIFIERS.--See Amplifiers, Multi-Stage.
MUTUAL INDUCTION.--See Induction, Mutual.
MUSH.--Irregular intermediate frequencies set up by arc transmitters which interfere with the fundamental wave lengths.
MUSHY NOTE.--A note that is not clear cut, and hence hard to read, which is received by the heterodyne method when damped waves or modulated continuous waves are being received.
NATIONAL ELECTRIC CODE.--See Code, National Electric.