Plate XXXII. — Compound Angles
In the stroke illustrated, a ⅝ full delivery of the cue-ball on object-ball 1 is absolutely necessary, with the cue-ball struck exactly ⅝ left centre.
Cue-ball ⅝ left, object-ball ⅝ left; stroke, “ordinary.”
If the cue is delivered below the centre of the cue-ball, with the object-ball 1 touching the cushion, the cue-ball will rebound at an acute angle that generally fails to effect the carom. The objective point is the cushion at b, which insures the stroke, and if the angle be always calculated from a point on the second cushion with the cue-ball so delivered as to reach that spot, the remainder of the stroke is assured and will take care of itself. That is to say, draw the angle required from the object-ball to the first cushion, then from that point to the second cushion.