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Bulletin - United States National Museum. Science. Figure 12.— I hi-: Kater convertible pendulum in use is placed before a clock, whose pendulum bob is directly behind the extended "tail" of
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Bulletin - United States National Museum. Science. !30 Figure 21. Ki i rsibi i pendulum apparatus of Defforges, as constructed by Brunncr, Paris, about 1887. The clock and telescope used to
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