“The lecture concludes with a demonstration showing that a free body in hyperbolic non Euclidean space may be so fashioned as in real time to carry out the actual motions of the top. The form of such a body and the forces to actuate it are specified. Klein lays great stress on the beauty of this generalization. …The full geometry of this case is not carried out in these lectures, however, and Klein regrets that the development of the automorphic functions has recently fallen into abeyance.”

—  Carl Barus

"The Mathematical Theory of the Top" (April 8, 1898)

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Carl Barus 15
U.S. physicist 1856–1935

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