b. ROCKING LADDER is a form of continuous ladder in which the number of Steps of the ladder before reversal of direction and the size of the steps are both specified beforehand.
The object is to increase the pattern size and still maintain sufficient projectile density to ensure hits.
The steps of the ladder are never larger than the pattern size, and the number of steps is such as will ensure covering probable ranging and aiming errors and target maneuvers during time of flight.
If used with continuous fire the steps are applied at regular predetermined time intervals; if with salvo fire, after each salvo.