Her Majesty may from Time to Time, by and with the Advice of Her Privy Council, fix the Establishments to be maintained by the Trinity House, the Commissioners of Northern Lighthouses, and the Port of Dublin Corporation respectively on account of the Services of Lighthouses, and to be maintained by the Trinity House on account of the Services to which the said Ballastage Rates are to be applied aforesaid, or the annual or other Sums to be paid out of the said Mercantile Marine Fund in respect of such Establishments ; and if it appears that any Part of the Establishments of the Trinity House, or of the Commissioners of Northern Lighthouses, or of the Port of Dublin Corporation respectively is maintained for the Purposes of this Act, and also for other Purposes, to fix and from Time to Time alter the Portion of the Expense of such Establishments to be paid out of the said Mercantile Marine Fund; and no Increase of any Establishment or Part of an Establishment so fixed shall be made without the Consent of the Board of Trade.