In order to carry out the provisions of Section 47-1-3, the board of supervisors of each county in this state are authorized and directed, whenever it may be necessary to buy or lease a sufficient number of acres of land within reasonable and convenient distance of the county jail to be used by the county as a county convict farm. They are also authorized to make any necessary improvements thereon, such as erecting necessary and convenient buildings, clearing, terracing and ditching and leveeing, or otherwise repairing and improving such farm, so that it may be suitable to be used as a farm upon which to work the convicts committed to the county jail, and they shall employ a competent and suitable person to be known as foreman of county farm to superintend such convict farm and manage it and to work the convicts sentenced to the county jail thereon. The board of supervisors in each county shall also have full and complete authority to buy, or rent necessary mules or horses, tractors, farming tools and implements and all other necessary things incidental to the successful operation of such convict farm in such numbers and amounts as they may reasonably contemplate will be necessary to successfully operate such farm, having in view, first, the continuous employment of all the convicts able to work thereon at remunerative labor, and second, the operation of said farm in the most economical manner consistent with the continuous working of such convicts.