Procedure on repeated committal of a prison offence.

If any person in the prison premises is guilty of a serious prison offence, which by reason of his having committed more than three times and such offence or otherwise, in the opinion of the officer-in-charge, is not adequately punishable by the infliction of any punishment which he has the power to inflict under this Act, the officer-in-charge shall forward the case of such prisoner to the competent Magistrate having jurisdiction, together with a statement of the circumstances, and such Magistrate shall thereupon try the charge so brought against the prisoner, and upon conviction, may sentence him to imprisonment for a term which may extend to three years. Such term shall be in addition to any other term which such prisoner may be already undergoing.