(a) Method. All votes taken in the Common Council shall be by yeas and nays; but, upon the demand of the Mayor or any member of Council made before such vote is taken, the roll shall be called and a record made by the City Recorder of the vote of every member voting.
(b) Roll Calls. All roll calls made for a vote in the Common Council shall be made alphabetically, and every member shall vote when his name is called, unless personally interested in the matter being voted upon or excused from voting by Council.