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The spiral stair is a type of stairway which, due to its complex helical structure, has been introduced relatively late into architecture. Although the oldest example dates back to the 5th century BC, [ 1 ] it was only in the wake of the influential design of the Trajan's Column that this space-saving new type permanently caught hold in ancient ...
The chapel was commissioned by the Sisters of Loretto for their girls' school, Loretto Academy, in 1873. Archbishop Jean-Baptiste Lamy had brought in two French architects, Antoine Mouly and his son Projectus, to work on the St. Francis Cathedral project, and suggested that the Sisters could make use of their services on the side to build a much-needed chapel for the academy. [4]
Good lighting is important in a staircase so users see where they are going and to prevent falls. [6] There is often a window on the wall to let in daylight.In many cases, indoor stairs are placed far inside the building structure, and it is often not easy to get access to a wall on the outside where it would be natural to have a regular window for letting daylight in.
A door may swing across the landing at the bottom of the flight but must leave a clear space of at least 400 across the whole landing Tapered steps. There are special rules for stairs with tapered steps as shown in the image Example of Winder Stairs above Alternate tread stairs can be provide in space saving situations Guarding
The Penrose stairs were created by Lionel Penrose and his son Roger Penrose. [3] A variation on the Penrose triangle , it is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop, so that a person could climb them forever and never get any higher.