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I think you're saying that the pendulum itself is an iron bar.

-- The period of the swing is determined by the pendulum's length. Whether the pendulum
is a long distributed mass, or just all one lump down at the end, its effective length in
either case is the distance from the pivot to its center of mass.

-- Rising temperature makes the iron bar longer, but doesn't change its mass. So its
center of mass becomes farther from the pivot, and its period of swing increases.

-- So higher temperature would make the clock run slower.

This sounds like an elegant way to detect small differences in local gravity at different
places. I don't know for a fact, but I'll just bet that this is how it's actually done, with
a portable instrument based on a pendulum-regulated timekeeping device.

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12y ago

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