Path of a pendulum
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“When the pendulum hands at rest in a vertical position, as Pa, it has no energy at all. Considered as a mass of matter seperate from the earth; it certainly has potential energy; but considered as a pendulum, it has not.” — Avery, 1895
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General PhysicsSource
Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 87
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