| 摘要 |
A bowling ball having thumb and finger holes for gripping said ball, said ball having a geometric center and when thrown consistently having a ball track plane and a spin axis, said spin axis being perpendicular to said ball track plane, said ball comprising: a first weighting means located within said ball along said spin axis on a positive side of said ball, said first weighting means having a weight of W1 and being located a distance D1 from said geometric center; and, a second weighting means located within said ball along said spin axis, said second weighting means having a weight W2 and being located a distance D2 from said geometric center, W1 being greater than W2, D1 being less than D2, said first and second weighting means being on opposite sides of said geometric center along said spin axis, said first and second weighting means placed along said spin axis so that W1D1=W2D2.
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