The said Dover Harbour Board shall consist of Seven Members, Four of whom shall form a Quorum; the said Seven Members shall be the Lord Warden for the Time being of the Cinque Ports, Two Burgesses of the Borough of Dover elected by the Town Council every Three Years, and to be eligible for Re-election, a Member to be from Time to Time appointed by the President of the Board of Trade for the Time being, a Member to be from Time to Time appointed by the First Lord of the Admiralty for the Time being, a Member to be from Time to Time appointed by the South-eastern Railway Company under their Common Seal, and a Member to be from Time to Time appointed by the London, Chatham, and Dover Railway Company, under their Common Seal: Provided, that in the event of either or both of the said Railway Companies failing or declining to appoint a Member of the said Harbour Board within One Calendar Month' after having been required so to do by the President of the Board of Trade, then such President shall, from and after such Default, be entitled thereafter to appoint from Time to Time another Member or Members in lieu thereof, as the Case may be ; and the said Lord Warden shall ex officio be Chairman of the said Harbour Board; and the said Lord Warden shall also from Time to Time nominate under his Hand One of the Members of the said Harbour Board to be his Deputy, to preside at all Meetings at which the said Lord Warden shall not be present; and in the event of an Equality of Votes at any Meeting of the said Board the Chairman of such Meeting shall be entitled to a Casting Vote in addition to his ordinary Vote.