If any prisoner is guilty of any offence against any prison discipline which, by reason of his having frequently committed such offences, or otherwise, in the opinion of the Superintendent is not adequately punishable by the infliction of any punishment which he has power under this Act to award, the Superintendent may forward such prisoner to any Magistrate of the First Class having jurisdiction together with a statement of the circumstances, and such Magistrate shall thereupon inquire into and try the charge so brought against the prisoner, and, upon conviction, may sentence him to imprisonment which may extend to one year, such term to be in addition to any term for which such prisoner was undergoing imprisonment when he committed such offence, or may sentence him to any of the punishments to which he is liable under section 46:
Provided that no person shall be punished twice for the same offence.