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Published online by Cambridge University Press: 03 November 2016
To the ordinary student simple harmonic motion is the motion of the bob of a swinging pendulum, of a mass at the end of an oscillating spring, or of a point on the rim of an oscillating fly-wheel; by definition, a body or particle is moving in simple harmonic motion if its acceleration is proportional to its distance from a fixed point, and directed towards that point.
Page 173 of note * Demonstrated to the London Brangh, January 1937.
Page 173 of note † Made by Messrs. G. Cussons, Ltd., Manchester, 7.