Waves on ropes - vertical and horizontal polarization

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• Waves on ropes I: A Youtube clip: First the gentleman excites waves of vertical polarization on the ropes, and next waves of horizontal polarization.
• Waves on ropes II: Another similar Youtube clip: Here waves of horizontal polarization can be better seen.
• A simple "polarizer" of waves on a rope: the idea. Run the flash animation: By chaotic motion of the hand holding the rope end, waves of different polarizations are excited; however, only those with vertical polarization can pass through the vertical space between the poles.