| 摘要 |
A ball used in sports that is normally propelled to a target includes markings for sighting of the ball to the target by aligning the markings on the ball with the intended line of travel and then focusing on the markings as the ball travels to the target and observing the markings to determine the uniformity of ball rotation. Markings on the ball also serve to make it possible to note the number of revolutions the ball makes in traveling to the target, thereby increasing the sportsman's awareness, concentration and accuracy. Specific indicia markings are disclosed for golf balls and basketballs as examples. In the case of a conventional basketball, indicia extends transversely across the panels and substantially around the ball at the center, giving the appearance of a continuous 360 DEG line when the ball is rotated uniformly. In the disclosed method of using the basketball, the shooter orients the ball so that the indicia is in a vertical plane including the intended shooting projectory line, and then observes the indicia after shooting the ball, in order to determine how uniformally the basketball rotated by noting the extent to which the indicia remains in the vertical plane while the ball is rotating.
|
