The Admiralty may at any Time require any Clerk or other Person employed in a subordinate Civil Capacity in connexion with Greenwich Hospital, for whom an Annuity is provided as aforesaid, to serve in England under the Admiralty in any suitable Civil Capacity, regard being had to the former Position of such Person in connexion with the Hospital, and at a Salary not less than the Amount of the Emoluments of his Employment in connexion with the Hospital; and if any such Clerk or other Person being required fails so to serve, the Admiralty may direct that the Annuity so provided for him cease to be paid to him, and the same shall so cease, and shall revert to and be deemed Part of the Income of Greenwich Hospital.