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#380767
A wheel or disk mounted to spin rapidly about an axis and also
free to rotate about one or both of two axes perpindicular to
each other and the axis of spin so that a rotation of one of the
two mutually perpendicular axes results from application of
torque to the other when the wheel is spinning and so that the
entire apparatus offers considerable opposition depending on
the angular momentum to any torque that would change the direction
of the axis of spin.