Upon receipt of a certified copy of such resolution the bar board is empowered and, within sixty days thereafter, is obligated to create and continue a legal aid bureau as soon and as long as the necessary funds so allocated are made available by the county board, all expenditures for the bureau to be limited to county funds so supplied, except only as hereinafter authorized. The bar board is vested with the ultimate power to control by its rules and regulations such bureau, the immediate supervision of which in actual operation shall be by the bar board itself or by a committee of its selection.