§ 6103. Appropriations and expenditures. The state university trustees shall maintain general supervision over the requests for appropriations, budgets, estimates and expenditures of such college. All moneys received from state appropriations or derived from other sources in the course of the administration of such college shall be expended upon vouchers approved by the chancellor of the state university, as the chief administrative officer of the state university, or by such authority or authorities in the state university as shall be designated by the chancellor by a rule or written direction filed with the comptroller, when and in the manner authorized by the state university trustees.