American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 183
cycloidal curve on thewall. This curve has many curious and val-uable properties. The line A B is called thebase of the cycloid, and is equal to the cir-cumference of the generating circle C D, andthe distance from C to E is the distance thepoint of suspension of a pendulum ought tobe to fit into… … point, P P, it may begin to fall, it will arriveat the lowest point, D, in precisely the sametime. If a body has to descend by the forceof gravity from the point A to another point*D, not in the same vertical, it will accomplishthe passage in less time by describing thecycloid A P P D than by…
Clocks and watches
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