(1) All staircases shall be constructed entirely of the bricks, stone, cement or concert with fire-resisting roof and ceiling and shall ba·ve, solid square (as distinguished from span drill) steps and landings of approved stone or of such other fire-resisting material and construction as may be approved by the Licensing Authority with treads not less than 28 centimeters side and with risers of not more than 15 centimeters side (each lapping atleast 2.5 centimeters over the back edge of the steps below it) in flights of not more than 15 or less than 3 steps.
(2) The treads and risers of steps on each flight shall be of uniform width and height.
(3) The several flights of such steps shall be properly supported and enclosed to the satisfaction of the Licensing Authority.
( 4) No staircase shall have more than two flights or 15 steps without a turn and the width of the landing between such flights shall be at least the same as the width of the staircase.
(5) The floors of alJ landings shall not be less than 15 centimeter.s thick.
(6) Every staircase forming exists from an upper gallery or tier of the auditorium shall be enclosed on both sides with walls of brick or of fire-proof materials in the stories through which it passes, and no openings shall be made in the auditorium except the one required for exist from the gallery or tier which it serves, provided that staircases leading to the first or lower gallery or tier may be left open on one side, in which case the open side shall be provided by stout handrails and balustrades, but in no case shall staircases be left open on both sides.
(7) All enclosed staircases shall have on both sides strong handrails firmly secured to the wall by strong metal brackets about 7 .5 centimeters clear therefrom and about 90 centimeters above the stairs but such handrails shall not run on level platforms and landing where the same is more in length than the width of the stairs.
(8) Where the flight of steps retu~ upon itself the newel wall shall be chased so as to allow the handrails to turn without projecting over the landing.
(9) Stairs turning at an angle shall have a proper landing without winders being introduced at the tum.
(10) There shall be no recesses or projections in the wall of such staircases within 1.5 meters of the floor and any fittings for lighting shall be at least 2.03 meters above the steps or landing.
(11) Nothing in this rule shall apply lo premises in any area duly license for use for cinematograph exhibition before the coming into force of these ruJes in that area.