Transactions section: Preprint of corresponding pages from the current Annual AIEE transactions volume: Resonant-circuit constant-current regulators

Airport-approach and runway-marker light circuits are quite similar to the usual street-lighting circuits, except that the important additional feature of brightness control is required. Standard moving-coil regulators were found to be unsatisfactory for this purpose, and so the development of resonant-circuit constant-current regulators with built-in brightness control was fostered by the Army Air Forces. Four years of service have proved regulators of this type to be entirely satisfactory, and they have been adopted as standard by the Army, Navy, and Civil Aeronautics Administration.