There shall be three borough auditors, two elected by the burgesses, called elective auditors, and one appointed by the mayor, called mayor's auditor.

An elective auditor must be qualified to be a councillor, but may not be a member of the council or the town clerk or the treasurer.

The mayor's auditor must be a member of the council.

The term of office of each auditor shall be one year.

The appointment of the mayor's auditor shall be made on the ordinary day of election of the elective auditors.

On a casual vacancy in. his office an appointment to fill it shall be made within ten days after the occurrence of the vacancy.