In any charter township, in addition to the supervisor, the charter township board may provide for the appointment of assessors, not exceeding 2, for such charter township. Such assessors, when appointed, shall be clothed with all the powers and duties of supervisors in the assessment of property for taxation within such township and shall receive for their services such compensation as may be allowed by the charter township board. Whenever assessors shall be appointed, as in this act provided, the supervisor shall be the chief assessing officer and such assessors shall in all cases be subordinate to such supervisor. Upon completion of the assessment and the making of the rolls, such rolls shall be deposited with the supervisor.