| 摘要 |
A baseball bat for striking a spherical or spheroidal projectile having strike surface roughening characteristics in the nature of macroscopic grooves and superimposed microscopic roughening which are adapted to enhance the tendency of the projectile to spin when struck off-center or struck a glancing blow by the bat. The promotion of such tendency to spin enhances the tendency of the trajectory of the ball, after being so struck, to deviate from the trajectory that would be expected if the tendency of the projectile to spin were not thus enhanced. Utilization of the bat with a ball having similar surface roughening characteristics further enhances the deviating nature of the trajectory of the struck ball.
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