The proceeds of such bonds shall be used solely for the payment of the cost of the
project or combined project and shall be disbursed under such restrictions, if any,
as the resolution authorizing the issuance of the bonds or the trust indenture hereinafter
mentioned may provide. If the proceeds of such bonds, by error of calculation or otherwise,
shall be less than the cost of the project or combined project, unless otherwise provided
in the resolution authorizing the issuance of the bonds or in the trust indenture,
additional bonds may in like manner be issued to provide the amount of such deficit,
which unless otherwise provided in the resolution authorizing the issuance of the
bonds or in the trust indenture, shall be deemed to be of the same issue and shall
be entitled to payment from the same fund without preference or priority of the bonds
first issued for the same purpose. If the proceeds of the bonds of any issue shall
exceed the amount required for the purpose for which such bonds are issued, the surplus
shall be paid into the fund hereinafter provided for the payment of principal and
interest of such bonds.