An Act amending the act of May 8, 1929 (P. L. 1643, No. 510), entitled "An act relating to the collection of city, county, school, and poor taxes within the territorial limits of cities of the second class A; establishing the office of collector of taxes therein; defining its duties and powers; changing the powers of and imposing duties upon cities of the second class A, counties, school districts and poor districts, and the officers thereof; and imposing penalties," providing that the salary of tax collectors in second class A cities shall be fixed by a salary board; and changing the composition of the salary board.