All election board judges and clerks shall be appointed by the county election officer and shall be subject to his direction and supervision. If practicable, not less than ten (10) days prior to the day of any election, the county election officer shall appoint the judges and clerks for the election boards for such election. Thereupon, the county election officer shall notify such persons in writing of their appointment, and file in his office a written statement of such appointments. Such notifications and statements shall be in a form approved by the secretary of state.