Hunter's Screw
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“Under intense pressure, the smaller threads on the screw may break. Therefore a larger screw with a threaded bottom is used for strength. As the larger screw turns, the smaller screw ascends tightly into the larger.” —Quackenbos 1859
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G. P. Quackenbos A.M. A Natural Philosophy: Embracing the Most Recent Discoveries in the Various Branches of Physics, and Exhibiting the Application of Scientific Principles in Every-day Life (New York: D. Appleton and Company, 1859) 116
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