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.