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Traveling Waves Demonstrated by a Revolving Helix

A simple procedure for the demonstration of traveling waves in actual morion in the classroom is described. Using a matched set of experimental data on a) peak amplitude of basilar membrane oscillations, and b) phase-lag along the membrane, both for a given frequency of stimulation, it is possible to construct a solid spiral, or helix, of constantly changing diameter and pitch. When projected on a screen, the helix will look like a longitudinal amplitude gradient along the basilar membrane; as the helix is rotated, the projection will appear as a traveling wave. It is suggested that the device, because of its inherent simplicity, is a useful aid in a teaching laboratory for future otolaryngologists, audiologists and other professionals related to the field of hearing.