The pensions granted under the terms of this chapter shall be based upon the average monthly rate of salary which such members shall have received during the three years immediately preceding the date of retirement, and shall be for a fixed amount that shall not increase nor decrease, regardless of any change in salary subsequent to the date of granting of the pensions for the rank or ranks that the members held prior to the granting of the pensions.

No pensions, benefits or return of contributions shall be granted to any person, nor shall any person be entitled to or receive any pensions, benefits or return of contributions under the provisions of more than one section of this chapter at the same time. (Ord. 3558-NS § 19, 1957)