The Board may from time to time borrow any sums of money, not exceeding in the whole seven hundred thousand dollars, in addition to any moneys heretofore authorized to be borrowed under or by virtue of any Act. The moneys borrowed under the authority of this Act shall be applied for the general improvement of the Otago Harbour in carrying out the works specified in the Schedule hereto:
Provided, however, that where the amount of moneys specified in the said Schedule against any particular work is more than sufficient for such particular work and leaves a surplus remaining after the completion of such particular work, such surplus may be applied in the completion of any other of the said works specified in the said Schedule if the amount appropriated to any such work is not sufficient for its completion:
And provided further that if on the completion of the whole of the works specified in the Schedule hereto it is found that any moneys raised are not required for the completion of the specified works, such surplus shall be paid into the sinking fund established under this Act or otherwise applied towards the repayment of the loan.