Abstract
This paper describes the making of, and results obtained with, an original form of mechanical vibration recorder. It is a teaching device for demonstration of various wave phenomena, and forms a universal apparatus for combining oscillations both linearly and rectilinearly. From a wide range of possible experiments, those described are: (a) recording a S.H.M. track; (b) logarithmic damping; (c) verification that time period and amplitude are independent for small arcs; (d) the beat effect; (e) linear superposition of harmonics on a fundamental; (f) the coupling effect: interchange of energy; (g) vibrations compounded rectilinearly.
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