Torsional wave device, large or small.

Kelvin Torsional Transverse Wave Model. Light weight rods are mounted, in a parallel fashion, on a long piece of spring-steel wire. An electric motor can be used to introduce a periodic oscillation to one rod, and a transverse wave travels down the length of the apparatus. The opposite end can be free or tied down, or connected to a dash-pot assembly for damping, or connected to another model of same or different dimensions.
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Demo Diagram: