Double Wedge
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“Two wedges have been placed toward one another underneath the weight. Equal force is applied to each wedge which raises the weight.” —Quackenbos 1859
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WedgesSource
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) 112
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