A copy of the health ordinance or section of the code alleged to have been violated, certified to under the hand of the clerk or president of the local board, and under the seal of such board, if it has a seal, shall be taken as full and legal proof of the existence of such ordinance or code, and that all requirements of law in relation to the ordaining, publishing and making of the same, so as to make the same legal and binding, have been complied with, unless the contrary be shown.