On this occasion she was so much disturbed in mind as to find it necessary to open the bedroom door, and make a course for herself, comprising the full extent of the bedrooms from wall to wall; and while Mr. Dick and I sat quietly by the fire, she kept passing in and out, along this measured track, at an unchanging pace, with the regularity of a clock-pendulum.
There are no more uses of "pendulum" in the book.
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The clock uses a pendulum to keep time.
Now the pendulum has swung the other direction and voters are demanding...