The court is a statutory tribunal the jurisdiction of which is defined by statute. It is not such a superior court within the meaning of the proposition that all matters are within its jurisdiction unless the contrary is shown. This is the mark of a superior court as distinguished from an inferior court: Halsbury's Laws of England, 2nd ed., vol. 8, p. 530. Mandamus will not go to such a superior court: Halsbury's Laws of England, 2nd ed., vol. 9, p. 762. Section 17 (3) of the Commonwealth Conciliation and Arbitration Act 1904-1948 provides that the Arbitration Court shall be a superior Court of Record. But for the reason stated, this provision does not remove the court or its judges from the area of application of the writ of mandamus. Further, s. 75 of the Commonwealth Constitution provides that the High Court shall have original jurisdiction in all matters in which a writ of mandamus or prohibition or injunction is sought against an officer of the Commonwealth. The judges of the court are, it has been decided (see R. v. The Commonwealth Court of Conciliation and Arbitration and the President thereof and the Boot Trade Employes Federation; Ex parte Whybrow & Co. [2] ; R. v. The Commonwealth Court of Conciliation and Arbitration and the President thereof and the Australian Builders' Labourers' Federation; Ex parte Jones; Ex parte Cooper & Sons [3] ), officers of the Commonwealth within the meaning of s. 75 (v). The provision contained in s. 17 (3) of the Act does not remove the judges of the court from the category of officers of the Commonwealth. Their duties and powers are not so extensive now as they were under the Act before 1947, but they are of the same character. The application which is said by the prosecutor to come within the jurisdiction vested in the court by s. 25 is not an application for the exercise of any judicial power. It seeks action by the court in its arbitral jurisdiction, and, in this connection, it is not material whether or not the court, when acting in its judicial character, is in any sense a superior court. Therefore this court has a constitutional jurisdiction to issue the writ sought notwithstanding the statutory provision in s. 32 of the Act that a judgment, order or award of the court (even if a refusal to exercise jurisdiction is a judgment &c.) shall not be subject to mandamus: Australian Coal & Shale Employees Federation v. Aberfield Coal Mining Co. Ltd. [1] . The writ of mandamus is not a writ of right nor is it issued as of course. There are well recognized grounds upon which the court may, in its discretion, withhold the remedy.