Sec. 13.3.  MORTGAGE BONDS.
   When the city is authorized to acquire, own, or operate any public utility, it may, in accordance with the provisions of sections 23, 24, and 25 of Article VIII of the Michigan Constitution of 1908, issue mortgage bonds therefor beyond the general limit of bonded indebtedness prescribed by law in accordance with the provisions of the Michigan Constitution of 1908 pertaining thereto.