The letter suggests and supports the use of the accumulator, consisting of a parallel adder and a parallel-in/parallel-out register, as an AC-line cycle selector for integral-cycle power control. It indicates that the accumulator is the optimum cycle selector, meaning that the cycle distribution over time is as regular as theoretically possible; this property of the accumulator ensures that the low-frequency ripple in the output power is kept to a minimum. >
['J. Nieznański']
The accumulator in integral-cycle AC power control