American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 183
con-sume in falling vertically throughthe diameter is the same as thatin which it would roll down theincline plane C B, D B. or E B—in other words, bodies placed at A, C, D, and E, and aban-doned at the same instant to the action ofgravity, would arrive at B at the same time.In these proportions it… … Thus, if we take the straight line A B, andthe circle C D, and roll the circle backwardsand forwards along the straight line A B, apoint in the edge of the circle C D will de-scribe the cycloidal curve E C F. To bemore familiar, a wheel with a point projectingfrom the side of it at the extreme…
Clocks and watches
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