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Scientific American, Vol. 13, No. 21 (1865) (1865)
leaf 7
rential pulley, where the ad- vantage gained is by making one more tooth in one of thewheels the chain passes over than in the other. This block is so made, but is also geared, in addi- tion, by the common method ofa pinion, A, working in a spur wheel, B; on the shaft of the pinion an- other spur… … t=) © 1865 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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