American horological journal, devoted to practical horology (1869)
Miller, George B · New York, G. B. Miller · leaf 205
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 G, in Fig. G. Fig. 8 presents a… … of motion, as is shown in the diagram, andfrom the ends of this bar two small balls aresuspended by a piece of fine silken thread. Onthe top end of the pendulum rod there isanother bar fastened parallel with the one onthe pallets, and the force of these weights fall-ing on the points of the screws…
Clocks and watches
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