Опыт со струной 700 кадров в секунду

A rubber string is held with two nails on the ends and pulled from the middle to form the triangular shape, and then suddenly released. We see here the first milliseconds of the unusual oscillating mode (which is later destroyed by further cycles by non-linearity and friction, and decays into a familiar cosinus-like oscillation). Shot by repeated experiment time-lapse photography by a Nikon D200 camera and flash delay circuitry, 50 microseconds per video frame, 30 frames/second (1.5 milliseconds per second of the video). As a simple theoretical explanation to explain the shape, it can be considered that the symmetric initial conditions should produce a symmetric solution, which should also be a sum of leftward and rightward triangular waves forming the plateau. What is amazing though that it’s not a photoshop simulation, but a real video - and it behaves exactly as we would expect from the wave analysis. On the other hand, it can be also noted that the release event at the top cannot propag