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9Now as small wheels revolve with more difficulty than larger ones, so levers and yokes press most on the side which is the least distance from the fulcrum, and on the contrary they ease those who bear that arm which is at the greatest distance from the fulcrum. Inasmuch as all these machines regulate either rectilinear or circular motion by means of the centre or fulcrum, so also waggons, chariots, drumwheels, wheels of carriages, screws, scorpions, balistæ, presses, and other instruments, for the same reasons produce their effects by means of rectilinear and circular motions.
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