Quotation from: General ScienceWritten by: Bertha M. Clark |
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Cogwheels are modifications of the wheel and axle. Teeth cut in _A_ fit into similar teeth cut in _B_, and hence rotation of _A_ causes rotation of _B_. Several revolutions of the smaller wheel, however, are necessary in order to turn the larger wheel through one complete revolution; if the radius of _A_ is one half that of _B_, two revolutions of _A_ will correspond to one of _B_; if the radius of _A_ is one third that of _B_, three revolutions of _A_ will correspond to one of _B_.
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