From and after April 6, 1939, no pension shall be granted to any member of the Police Department of the City employed on or before June 30, 1957, except under the terms and provisions of this chapter and from and after April 6, 1939, this chapter shall be the exclusive method of granting pensions to such members. (Ord. 3550-NS (part), 1957: Ord. 2250-NS § 36, 1939)