A system of natural philosophy, designed for the use of schools and academies (1845)
Moffat, J[ohn] M. [from old catalog] · Philadelphia, E. C. Biddle · leaf 114
espectively produced. A true case of rolling frictiontakes place only when the rollers are so situated as to have no necessityof employing axles ; as when cylinnders or cannon-balls are placed be-neath heavy weights. The wheel-carriage is not a case of this kind, forit only transfers the friction… … RIGIDITY OF CORDAGE. Ill construct the axle and the box, or central part of the wheel, ofvery hard substances, the surfaces of which are not only renderedas smooth as possible, but also covered with oil, or some otherunctuous matter, which facilitates the motion of the correspondingparts. But where…
Physics
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