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At the last eeting of the Society, I shew'd the inconveniency of Mons.Perault's new kind ofaxis in peritrochio , or roller fix'd into a large pully; shewing not only, that by the use of this engine we must lose force, whose value is seldom to be recompens'd by the time we gain, but also that the stiffness of the additional ropes which wind about the roller, in the operation;

III. A farther examination of the machine's said to be without friction. By the same