Text: A term signifying any periodic oscillatory motion as, for example, the vibration or beating of a pendulum. The illustration shows the manner of indicating simple harmonic motion. The distance A-B represents 360 degrees of a circle, or, if it is assumed to represent a sine wave of alternating current, it will represent one complete cycle. Curves representing harmonic motion are used extensively in radio engineering to illustrate, in graphic form, the oscillations of an alternatmg current.

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