Midplane/Vertical Axis Line
Revision as of 07:03, 20 April 2011 by Trackbowler (talk | contribs)
Midplane/Vertical Axis Line: A line perpendicular to the midline that passes through the bowler’s positive axis point and the negative axis point when extended completely around the ball. Separates top of ball from bottom of ball on the bowler’s axis of rotation