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“When force is applied at bar P which turns the screw. The plate B moves vertically with the screw, but does not turn. This allows the books to be compressed as the plate descends.” —Quackenbos 1859




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) 115


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