Using a Screw to Raise Weight

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“A screw is a cylinder with a helical proection winding around its circumference. This helix is called the thread of the screw. The distance that a point of the helix is drawn back or advanced in the direction of the length of the screw during one turn is called the pitch of the screw.” —Hallock 1905




V. I. Hallock I.C.S. Refrence Library (Scranton: International Textbook Company, 1905) 7:33


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