The mayor will be the presiding officer at all meetings of the city council. The mayor shall be considered a full-time officer of the city. However, the mayor shall not be entitled to cast a vote upon any resolution or ordinance unless it is to create or break a tie vote. The mayor shall be recognized as head of the city government for all ceremonial and legal purposes, and shall execute and authenticate legal instruments requiring a signature as such official. A mayor pro tem shall be elected by the councilmembers who shall act as mayor during the absence of the mayor with all power herein granted to the mayor. The mayor pro tem shall not be subject to the tie vote restriction relating to the mayor. (Ord. No. 73-193, 11-6-1973; Ord. No. 87-202, § 8, 11-3-1987; Ord. No. 93-74, § 1, 11-2-1993)