This motion may be approximated by that of the tines of a tuning fork when struck, and could be seen as a sinusoidal or SINE WAVE from the trace of a pen attached to the tine and moving against paper ...

Compare: FOURIER SYNTHESIS, HELMHOLTZ RESONATOR, LAW OF SUPERPOSITION, SIMPLE HARMONIC MOTION, SOUND ANALYSER ... with a fundamental frequency near 550 Hz (C sharp). Time, measured in units of one ...