As soon as convenient after the passage of this Charter the Council in being of said Town shall divide the territory of said Town into wards, the number of which shall be determined by the Council, but there shall not be less than three wards, which said wards shall be as nearly equal in population as possible and each shall consist of compact territory and have a population of not less than five hundred people; the number and limits of which said wards shall remain until otherwise changed by the Common Council of said Town, and a record and map of said wards shall be entered upon the journal of the Common Council of the said Town and preserved. No change shall be made in the number or the limits of said wards within six months previous to any regular election to be held for the election of Town officers.