The state treasurer shall be the custodian of the several trust funds of the retirement system. All payments from said funds shall be made by him on warrants or vouchers issued and signed by such person as is designated by the board. A duly attested copy of a resolution of the board designating such person and bearing on its face the specimen signature of such person shall be filed with the director of accounts as his authority for issuing warrants upon such vouchers. No voucher shall be drawn unless it has previously been authorized by resolution of the board.
T.C.A. § 8-3444