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ID Code: G1-83
Purpose: Create waves in a very dramatic way using a series of carefully adjusted pendula of various lengths.
Description: This is a commercial version of our demonstration G1-82: Pendulum Waves. After the pendula are started into oscillation in phase, they pass through a series of various standing wave and traveling wave patterns, finally returning to their initial mode, in which they were all in phase.
Availability: Available

demonstrations.wolfram.com/AliasingInPendulumWaves/ offers both further discussion and an animation of this phenomenon, and a list of further references - including one by our own Dr. Richard Berg.