(1) All staircases shall be constructed entirely of bricks, stone, cement or concrete with fire -resist ing roof and ceil ing and shall have solid square (as dist inguished from spandril l) steps and landings of a pproved stone or of such other fire -resist ing material and construction as may be approved by the l icensing authority with treads not less than 11 inches wide and with risers of not more than 6 inches high (each lapping at least one inch over the back edge of the steps below it) in fl ights of not more than 15 or less than 3 steps.
(2) The treads and risers of steps on each f l ight shall be of uniform width and height.
(3) The several f l ights of such steps shall be properly supported and enclosed to the sat isfaction of the l icensing authority.
(4) No staircase shall have more than two fl ights of 15 steps without a turn and the width of the landing between such fl ights shall be at least the same as the width of the staircase.
(5) The floors of al l landings shall not be less than 6 inches thick.
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(6) Every staircase forming an exit from an upper gallery or t ier of the auditorium shall be enclosed on both sides with walls of bricks or a fire -proof materials in the storeys through which i t passes, and no openin gs shall be made in the auditorium except the one required for exit from the gallery or t ier which i t serves, provided that staircases leading to the first or lower gallery or t ier 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 staircase be left open on both sides.
(7) All enclose staircases shall have on both sides strong handrails f irmly secured to the wall by strong metal brackets about 3 inches clear therefrom and abo ut 3 feet above the stairs but such handrails shall not run on level platform and landings where the same is more in length than the width of the stairs.
(8) Where the fl ight of steps returns upon i tself the newel shall be chased so as to allow the handrails to turn without projecting over the landing.
(9) Stairs turning at an angle shall have proper landing without winders being introduced at the turn.
(10) There shall be no recesses or projections in the walls of such staircases within 5 feet of the floor and any fi t t ings for l ighting shall be at least 6 feet 8 inches above the steps or landing.
(11) Nothing in this rule shall apply to premises duly l icensed in any part of the State for use for cinematograph exhibit ion before the c oming into force of these rules .