10. 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.