The clerk of the chancery court shall have power, with the approbation of the court, or of the judge in vacation, to appoint one or more deputies, who shall take the oath of office, and who thereupon shall have power to do and perform all the acts and duties which their principal may lawfully do; such approval, when given by the judge in vacation, shall be in writing, and shall be entered on the minutes of the court at the next term.