Top and bottom spin does not change the Path of the CB on its way to the object ball. After contact with the OB the CB must take the tangent for some distance and that distance is determined by the speed of the CB.
With Pure Side Spin (contact on the equator) the CB may take a non linear path to the OB depending again on speed. After contact the CB still and must take the tangent for some distance before the Path changes.
I've always defined the tangent as the line perpendicular to the line determined by the contact point through the center of the 2 balls. I've just learned but still don't understand how to visualize this but the tangent is determined by the line of the Release Point.
High Low Side may be clearer terms but I think the effects described above is the reason English means Side spin and High or Low is not considered English.
With Pure Side Spin (contact on the equator) the CB may take a non linear path to the OB depending again on speed. After contact the CB still and must take the tangent for some distance before the Path changes.
I've always defined the tangent as the line perpendicular to the line determined by the contact point through the center of the 2 balls. I've just learned but still don't understand how to visualize this but the tangent is determined by the line of the Release Point.
High Low Side may be clearer terms but I think the effects described above is the reason English means Side spin and High or Low is not considered English.