| 摘要 |
A golf ball having a would center and a dimple less outer surface having a constant diameter of 1.75 inches and a smoothness which is determined by rolling a golf ball between upper and lower parallel glass plates supported by four support legs and monitoring any changes in an amount of forced needed to roll the ball between the plates for detecting the presence of an imperfection upon the surface of the ball or an out-of-round ball.
|
