Having established the fact that a ball will curve in the direction of the least resistance, it is only necessary to alter the direction of the axis of rotation in order to change the direction of the curve. Thus, if in the cut first given the ball were rotating in the direction of D H I instead of I H D, the ball would curve, not toward F, but to the right. So, also, if the axis of rotation is horizontal instead of vertical, and the greatest resistance is made to come on top, the ball will curve downward, or "drop." And in the same way, by imparting such a twist that the resistance falls on some intermediate point the ball may be made to take any of the combination curves known as the "outward drop," the "rising out-curve," and so on through the entire category.