When the said annual income upon the investments in said sinking fund shall reach the sum of $50,000, the making of said investments for said purpose shall cease, and the said annual income of $50,000 arising therefrom shall be thereafter appropriated and applied to the payment of the annuity of $50,000 to the Trustees of the Enoch Pratt Free Library of Baltimore City, and all taxation for the purpose of raising said annuity of $50,000 for such purpose, shall cease and be discontinued. City Code, 1893, art. 39, §5 1927, art. 34, §5 1950, art. 26, §5 1966, art. 1, §75 1976/83, art. 1, §76 Ord. 1883-064