57.—Second Pulley System.details

[Picture: 57.—Second Pulley System.]
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Image title: 57.—Second Pulley System.
Source: Lodge, Oliver J.: “Elementary Mechanics, Including Hydrostatics and Pneumatics. Revised edition” (1882)
Keywords: pulleys, machinery, diagrams, greyscale
Status: out of copyright (called public domain in the USA), hence royalty-free stock image for all purposes usage credit requested
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The only system of pulleys frequently employed for hoisting is what is called the second system, where there are two blocks of pulleys, one attached to the weight, and the other to the beam; and where the same rope passes round all (fig. 57). The mechanical advantage in this case is simply equal to the number of strings sup­porting the weight: which in the figure happens to be four. (p. 138)

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