Chief Judicial Magistrate may, from time to time, define the local limits of the areas within which the Magistrates appointed under section 11 or under section 13 may exercise all or any of the powers with which they may respectively be invested under this Code: 3[Provided that the Court of Special Judicial Magistrate may hold its sitting at any place within the local area for which it is established.] (2) Except as otherwise provi ded by such definition, the jurisdiction and powers of every such Magistrate shall extend throughout the district. 4[(3) Where the local jurisdiction of a Magistrate, appointed under section 11 or section 13 or section 18, extends to an area beyond the dis trict, or the metropolitan area, as the case may be, in which he ordinarily holds Court, any reference in this Code to the Court of Session, Chief Judicial Magistrate or the Chief Metropolitan Magistrate shall, in relation to such Magistrate, throughout th e area within his local jurisdiction, be construed, unless the context otherwise requires, as a reference to the Court of Session, Chief Judicial Magistrate, or Chief Metropolitan Magistrate, as the case may be, exercising jurisdiction in relation to the said district or metropolitan area.]