Quotation from: General Science

Written by: Bertha M. Clark


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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