Wolfgang Pauli and Niels Bohr ponder the mystery of an inverting tippe top. The photo was taken in 1951. Others solved the mystery a few years later. (Photograph by Erik Gustafson, courtesy AIP Emilio Segrè Visual Archives, Margrethe Bohr Collection)
Three different tops showing (a) a tippe top, (b) a solid sphere with a small mass m attached to the outer surface, and (c) a hollow sphere with a small mass m attached to the inside surface. G is the center of mass and C is the geometric center of the sphere.
A conventional hollow plastic tippe top on the left and a spherical tippe top on the right. The one on the right is hollow but has a small piece of Blu-tack reusable adhesive stuck to the bottom.
Frame from video film taken at 300 frames/s of a tippe top spinning on a sheet of aluminum.
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