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from its not being by intervals, as the friftion%between the teeth of wheels is, and on that account being a diftindt objedt of light, I apprehendjwe eftimate it, in the comparifon, as more confi-derable than what it really is. But as the fridtion, whatever it may be, between the teeth of two wheels, muft be, while it lafts, greater than between a worm and wheel for the fame fpace of time, it feems to me no unreafonable fuppolitionrthat the aggregate of fridtion will, in the two cafes, nearly balance each other ; efpecially if it be takenMinto the account, that, to obtain the power of one worm and wheel, .there will be in moft cafes required two pair of wheels, and two additional axifes, all which will add to the fridtion. But, granting the balance of fridtion to be againft the. adtion of the worm, the power to overcomeit is greater in proportion than to overcome the fridtion of two wheels.In fpeaking of the fridtion between the teeth of wheeK I confider wheel-work as it is ufually con-ft rudted. Wheels, the teeth of which are formed upon the true epicycleidal principle, I am well apprifed, adt with no perceptible fridtion ; butfuch wheels are not yet much ufed, or underltood.%5 Were
Newspaper Details
Repertory of Arts and Manufactures
London, Middlesex, GB
Thu, Jan 01, 1795
Page 182
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Anonymous
USA 11 Nov 2022
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