15The application of the seal of the Corporation shall be authenticated by the signature of the chairman or of some other person authorised either generally or specially by the Corporation to act for that purpose and of one other member.
16Every document purporting to be an instrument made or issued by or on behalf of the Corporation and to be duly executed under the seal of the Corporation, or to be signed or executed by a person authorised by the Corporation to act in that behalf shall be received in evidence and be treated, without further proof, as being so made or issued unless the contrary is shown.