Where it appears to the appropriate officer, in the case of a person attending in pursuance of a summons under this Act, that on account of F1. . . insufficient understanding of English there is doubt as to his capacity to act effectively as a juror, the person may be brought before the judge, who shall determine whether or not he should act as a juror and, if not, shall discharge the summons; and for this purpose “the judge” means any judge of the High Court or any Circuit judge or Recorder.