| 摘要 |
<p>The invention provides a spin-top comprising a body (10) of substantially rotational symmetry around a longitudinal axis, the body having a curved outer surface for converting force having a vertical component applied thereto into a rotational force, the top being provided with at least one pointed end face (12) along the axis and the top being configured to have a first rest position with the axis substantially parallel with the ground, a second active position with the axis substantially perpendicular to the ground and an intermediate active position of rotation around the axis while the axis is still substantially parallel with the ground, the configuration of the top being such that upon application of a spin imparting force to the outer wall of the body while in the first rest position, the body is imparted with a forward motion combined with a backward spin to achieve the intermediate active position while also being imparted with a simultaneous turning motion around some point along its axis, a gyroscopic reaction causing the top to subsequently assume the second active position with the top continuing to spin about a vertical axis.</p> |
