Conveyance to an institution

(1) The person by whom any child ordered to be sent to a certified institution is detained shall at the appointed time deliver him into the custody of the constable or other person responsible for his conveyance to the institution, who shall deliver him to the person in charge of the institution together with the detention order. (2) The detention order in pursuance of which the child is sent to the institution shall be a sufficient authority for his conveyance and detention in the institution.