Section 258 - Powers and duties of deputy clerks of court of appeals1. Before entering upon his duties, the deputy clerk of the court of appeals must subscribe, and file in the clerk's office, the constitutional oath of office.2. While the clerk is absent from his office, or from the sitting of the court, or the office of clerk is vacant, the deputy clerk has all the powers and is subject to all the duties of the clerk.3. The special deputy clerk possesses, in the absence of the clerk, and the deputy clerk, the same power and authority as the clerk, at any sitting of the court which he attends, with respect to the business transacted thereat.