On a Dynamical Top, for Exhibiting the Phenomena of the Motion of a System of‪…‬

A body can spin while its axis wanders: its angular momentum stays fixed in space, though the motion within it grows intricate. James Clerk Maxwell opens with a problem even Newton, he says, chose not to tackle directly.

In this mid-19th-century study, Maxwell uses the freely rotating top to make the mechanics of a rigid body visible, not merely a maze of symbols. Starting from the conservation of angular momentum and energy, he traces the changing path of the top’s axis and shows how its motion can be pictured in space. The experiment reaches beyond the tabletop: Maxwell offers suggestions about the Earth’s own shifting axis, a question bound up with how we understand our planet’s motion. What can a spinning top reveal about the ground beneath our feet?

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