87.—Any matter or thing which is by this Act or any order or regulation made thereunder directed to be determined by an arbitrator appointed by the Minister shall be determined by one such arbitrator or such greater number of arbitrators as the Minister shall in regard to each such matter direct, and whenever the Minister directs that any such matter shall be determined by a greater number of arbitrators than one all references in this Act to the appointment of an arbitrator by the Minister or to the arbitrator so appointed shall in relation to such matter be construed as references to such appointment of such number of arbitrators or to such number of arbitrators so appointed.