section 819(1)


819(1) Where, in the case of an appellant who has been convicted by a summary conviction court and who is in custody pending the hearing of his appeal, the hearing of his appeal has not commenced within thirty days from the day on which notice of his appeal was given in accordance with the rules referred to in section 815, the person having the custody of the appellant shall, forthwith on the expiration of those thirty days, apply to the appeal court to fix a date for the hearing of the appeal.