Greenspan, Martin National Bureau of Standards.
- Methods of constructing
- Frequency measurements
- Phase measurements
- Links to Primary Literature
- Additional Readings
Plane curves traced by a point which executes two independent harmonic motions in perpendicular direction, the frequencies of the motion being in the ratio of two integers. Such figures, produced on the screen of a cathode-ray tube, are widely used in frequency and phase measurements. See also: Harmonic motion
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