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“Cylinder with a spiral of winding parallel ridges called Threads. If the Threads were unwound from the cylinder, it would be one continuous wedge.” —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) 114
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