The City shall be divided into wards, the future boundaries of which may be determined by the Council. Each ward shall contain at least four hundred and fifty, and not more than twelve hundred registered voters. In fixing ward boundaries, the Council shall take into consideration the boundaries of the voting precincts as determined by the County Court of Kanawha County. The Council may establish new wards, and define and change the boundaries of all wards; provided, however, that each ward must be composed of contiguous territory. Each new ward shall be entitled to choose one new member of the Council. Councilmen at large shall be added to the Council in the proportion of one for each four ward Councilmen or fraction thereof, and only one Councilman at large shall be elected from any one ward.