Screw with Lever Arm

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“The power is generally applied by a wheel or a lever, and moves through the circumfrence of a circle. The distance between the two consecutive turns of any on continuous thread, measured in the direction of the axis of the screw, is called the pitch of the screw.” -Avery 1895




Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 147


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