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1322853 Pendulograph C R WOOD and J WOOD 5 May 1972 [8 May 1971] 13862/71 Heading B6P A pendulograph comprises two pendulums 10 and 12 supported in gimbals 14 and 16, pendulum 10 supporting a counterbalanced pivoted arm 34 with a marking point, pendulum 12 supporting a board for a sheet of paper. The bob weight 24 for each pendulum comprises a frame 26 carrying two containers 28 (Fig. 2) for ballast such as sand or water.