W.2.3 Bell Wave Machine

This is the famous torsional wave device. Among the concepts that can be demonstrated are:

	Reflection of waves at the free end;
	Constancy of wave speed with amplitude;
	Superposition of waves;
	Traveling waves absorbed by exponential damper;
	Standing waves;
	Resonance;
	Phase changes upon reflection from fixed and free ends;
	Wave reflection at the boundary of two media;
	Impedance matching;
	Matching transformer;

A descriptive booklet is available.