Johnson's natural philosophy and key to philosophical charts : illustrated with 500 cuts; being reduced photographic copies of all the diagrams contained in the author's philosophical series of indestructible school charts ; for the use of schools and families (1878)
he circumferenceof the one, but unwinds aportion equal to the cir-cumference of the other;and if the two be nearlyequal, the weight has but aslight motion; and, con-sequently, the power hasgreat advantage over it.If the weight rise 1 inchwhile the power at thehandle describes 100 inches,1 pound… … MECHANICAL POWERS. Go By this device space and time are conveniently exchanged (or power.Differential pnlleys, Avorked by an endless chain, are arranged on thesame principle. 74 Figure 32.—Compound wheel and axle.—In the figuresuppose tiie small circles (the axlus) to be cog-wheels, working…
Physics · Astronomy
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