Multiple Pulleys
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“When a high degree of force is required, several moveable pulleys may be combined, as represented [here]. A and B are fixed pulleys; C and D are moveable ones, from the block of which the weight W is suspended” —Quackenbos 1859
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PulleysSource
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) 108
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