An Act amending the act of July 3, 1947 (P. L. 1228, No. 499), entitled "An act to establish in cities of the first class a house of detention for delinquent, dependent and neglected children up to eighteen years of age, ***," eliminating management and maintenance by a board of managers appointed by the judges of the Family Court Division of the Court of Common Pleas and providing for management and maintenance by the city where the house of detention is located.