s 17
It shall be the duty of the Board to conserve the Fund Duty of by so exercising and performing its functions and duties conserve under this Ordinance as to secure that the total revenues of the Fund. the Board are sufficient to meet all sums properly chargeable to its revenue account including, without prejudice to the generality of that expression, provisions in respect of its obligations under sub-section (3) of section 16, depreciation and interest on capital taking one year with another.