The board of supervisors may procure an artesian well on the property used for the courthouse, jail, county farm, or poorhouse, and owned by the county, by contract with some person or corporation to complete said well on said property, or by hiring laborers, manager, and machinery to sink the well under supervision of the board or some one appointed by it to superintend the work. The cost of said well shall be paid out of the county treasury, on the allowance of the board, as other accounts against the county are paid. The board of supervisors shall make the best contracts it can in the interest of the county in procuring said well, without advertising for the bidders as required by law in letting other contracts, but having the clerk of the board write a number of persons or corporations engaged in such work, inviting them to come before the board to submit propositions. If no proposition submitted is satisfactory, the board shall not accept any proposition at that meeting, but shall extend invitations as before for another meeting, and so continue until the board gets a proposition submitted that is satisfactory.