Section 3
SEC. 3. A standing annual appropriation is hereby made out of any general fund in the National Treasury of such sum as may be necessary to provide for the sinking fund created in the next preceding section and for the interest on bonds issued by virtue of this Act; Provided, That such sinking fund and interest may be paid from special funds specifically created for certain public works projects when such projects are financed from the proceeds of the sale of bonds authorized to be issued under this Act: Provided, further, That in the case of revenue-producing projects such sinking fund and interest shall be paid from the net income of the project and in the case of toll roads and bridges from the net toll collections thereon: Provided, still further, That when such receipts or tolls are insufficient, only then shall the payment of said sinking fund and interest be paid or disbursed from the annual appropriation appropriated under this Act. A further appropriation is hereby made out of the same funds in the National Treasury not otherwise appropriated of a sufficient sum to cover the expenses of the issue and sale of the bonds authorized by this Act.