Section 15. That the thirteenth and fourteenth sections of this act shall be and continue in force until the commissioners of Fulton county shall have certified to the court that a jail is erected and ready for the reception of prisoners, and approved of by the court and grand jury, who shall enter approbation signed by them on the records of said county, and from thenceforth it shall be lawful for the sheriff of Fulton county to receive all and every person or persons who may be then confined in the county jail of Bedford county, in pursuance of this act, and convey them to the jail of Fulton county, and to keep them in close custody until they be discharged by due course of law.