Such clerk may adjourn the taking of such testimony from day to day or from time to time, not exceeding thirty days at any one adjournment, until he shall have completed and closed his duties under the provisions of this article, but not continuing the taking thereof beyond the period prescribed in section ten of this article; after which he shall preserve the book or books containing his proceedings among the records of his office. Such clerk shall give certified copies of such depositions, whenever requested by any person to do so, and he shall receive the same compensation therefor as for other certified copies.