From and after April 28, 1938, no pension shall be granted to any member of the Fire Department employed on or before June 30, 1957 except under the terms and provisions of this chapter, and from and after April 28, 1938 this chapter shall be the exclusive method of granting pensions to such members. (Ord. 3549-NS (part), 1957: Ord. 2188-NS § 36, 1938)