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