Be it further enacted, that bonds may be authorized hereunder at one time or from time to time for hospital purposes without an election, and solely pursuant to proceedings by the governing body of the City of Crossville, notwithstanding any statutory provision to the contrary. Such bonds or any portion thereof may be payable exclusively from revenues, or exclusively from taxes, or from revenues and in the event of a deficiency in such revenues, from taxes or from taxes and additionally secured by a pledge of revenues, as provided in the proceedings authorizing same. (As amended by Priv. Acts 2014, ch. 55, sec. 1)