Sinking Fund.
Section 13
SEC. 13. Sinking Fund.—A sinking fund shall be established in such manner that the total annual contribution thereto accrued at such rate of interest as may be determined by the Boards of Directors as confirmed by the stock-holders representing a majority of the subscribed capital stock outstanding and entitled to vote, shall be sufficient to redeem at maturity the bonds issued under this Act. Such fund shall be under the custody of the treasurer of the Authority who shall invest the same in such manner as the Board of Directors may direct; charge all expenses of investment to said sinking fund, and credit the same with the interest on investment and other income belonging to it.