(1) All exits and other doors or openings intended to be used for the purpose of exit shall be indicated by notices in the la nguage understood in the locali ty in white let ters seven inches long, upon a black ground painted on or above the doors at least 6.9" above the floor.
(2) The words "No Exit" in the language understood in the locali ty, shall be similarly painted upon all doors in sight of the audience which do not lead to exits.
(3) All electric "Exit" signs shall be fi t ted with an auxil iary bulb capable of properly i l luminating the sign; the bulbs shall be fed from dry batteries or accumulators, which shall be kept in proper working order, the switch of the auxil iary bulbs shall be fixed in an easily accessible posit ion in the corridor and not inside the auditorium.
(4) Nothing in this rule shall apply to touring cinemas and to premises duly l icensed for use for cinematograph exhibit ion before the coming into force of these rules, so long as "Exi t" and ' 'No Exit" signs in such premises are clearly visible and easily legible.