Hale, Joseph W. L. (Joseph Woodwell Ledwidge), 1886- · New York [etc.] McGraw-Hill book company · leaf 66
ain passes underand supports the lower or movable block D, The otherloop of the chain hangs freely and is the loop upon whichone pulls in raising a weight on the hookE, The rims of the pulleys are groovedand carry lugs to prevent the chain fromslipping. If the radii of the large andsmall fixed… … As used a differential pulley can ac-tually lift only about 25 to 35 per cent,of the weight calculated for a given pullfrom the formula stated above. This means thereforethat to lift a given weight requires actually from threeto four times the pull calculated by the formula whichdoes not take…
Mechanics, Applied
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