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200 with great power, and the hoop no sooner touches the ground than it comes back to you. So great a degree of spin as this cannot possibly be given to a cricket ball; but you see the same effect in the "draw-back stroke" at billiards. Revolve the hoop with less power, and it will rise abruptly from the ground and then continue its course—similar to that awkward and abrupt rise often seen in the bowling of Clarke among others.

Thirdly, revolve the hoop as you bowl it, not against but in the line of its flight, and you will have its tendency to bound expended in an increased quickness forward. This exemplifies a low swimming ball, quickly cutting in and sometimes making a shooter. This is similar to the "following stroke" at billiards, made by striking the ball high and rotating it in the line of the stroke.

Such are the effects of a ball spinning or rotating vertically.

Now try the effect of a spin from right to left, or left to right: try a side stroke at billiards; the apparent angle of reflection is not equal to the angle of incidence. So a cricket ball, with lateral spin, will work from Leg to Off, or Off to Leg, according to the spin.

But why does not the same delivery, as it gives the same kind of spin, always produce the same vertical or lateral effect on a ball? In other words, how do you account for the fact that