The city treasurer shall appoint an assistant treasurer, who, in the absence or incapacity of the city treasurer to act, shall possess all the powers and perform all the duties of the city treasurer until the incapacity or inability of the city treasurer is removed or until a new city treasurer is elected or appointed and qualified. The city treasurer and his sureties shall be responsible for the acts of such assistant. The city treasurer shall also appoint such other officers and employes as may be provided for by ordinance.
53 P.S. § 12392