Fairbairn, William, Sir, 1789-1874 · London, Longman, Green, Longman, Roberts & Green · leaf 41
ines will be perpendicular to the curvatureof the epicycloid at these points.Thus, for example, b c drawnfrom the point of contact B tothe describing point c\ is anormal to the curve at thatpoint; and similarly a f is anormal to the curve at f. Suppose in the same planethree circles exy (fig.… … WHEELS AND PULLIES. 21 centres, which we suppose to be fixed, moving these circles bythe point of continual contact A, common to the three cir-cumferences; it is evident that all the parts of the circum-ference of the circle made to revolve will be applied insuccession to every part of the…
Mills and mill-work · Machinery
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