American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 205
it would not exert the same force fallinga given distance as it would do falling the samedistance when placed in the position of thedotted line, F, and the force would be propor-tionably greater if the gravity arm fell the samedistance when in the position of the line G.This illustration will be… … towards the end of the arc of its vibration. Ifa ball be placed at G, and the effectiveweight of the gravity arm be transferred tothat point, as is shown in Fig. 7, this error willnot be so great, and it will be diminished stillfarther if the balls be placed at an angle of 45degrees above the line…
Clocks and watches
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