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“The pulley is a lever with equal arms of the first or second class, but, when it moves. the attachments of the forces are moved. The underlying fact that enables the pulley to afford any mechanical advantage is the uniformity of the tension of the cord in all of its parts, the pulley itself serving only to diminish the friction.” — Avery, 1895




Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 142


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