High Speed and Technical Photographs / 4707 string

Prof. Andrew Davidhazy

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Random Vibration of a Spinning String

A loosely hanging string attached on one end to an eccentric on the shaft of a high speed motor and on the other to a small mass is made to spin rapidly. Unbalanced, the string starts to vibrate in a rapid and generally unpredictable fashion leaving a trace of its convolutions in space. These are recorded with a simple camera over a period of a second or two. The white lines indicate the limits of a given excursion of the string sideways. Since the string is seen by the camera to reside along these edges for a longer time than along motion in a transversal direction the edges appear better defined than the front of the vibration "envelope".