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https://en.wikipedia.org/wiki/Loretto_Chapel
Loretto Chapel is best known for its "miraculous" spiral staircase, which rises 20 feet (6.1 m) to the choir loft while making two full turns, all without the support of a newel or central pole. The staircase is built mostly out of wood and is held together by wooden pegs and glue rather than nails or other hardware.Architectural style: Gothic Revival
https://www.lorettochapel.com/info/staircase
The staircase has two 360 degree turns and no visible means of support. It is said that the staircase was built without nails—only wooden pegs. Questions also surround the number of stair risers relative to the height of the choir loft and about the types of wood and other …
http://www.pratanacoffeetalk.com/2011/03/mystery-of-staircase-solved.html
Mar 07, 2011 · THE MYSTERY OF THE LAREDO STAIRCASE SOLVED. ... In fact, they do not, and lateral or outer supports can be effectively substituted for a central support. However, this staircase appears to have a concealed central support, an inner wood stringer of a very small radius that, because of its small size, functions effectively as a central pole. ...
https://www.askthebuilder.com/loretto-staircase/
The point of my post is that the owners of the staircase are leveraging the LEGEND that the staircase has no means of support. That's WRONG as I state in my article. The curved stringers are simple beams. A beam does not have to be straight and a beam doesn't have to be LEVEL to work.
https://en.wikipedia.org/wiki/Stairway
Box stairs are stairs built between walls, usually with no support except the wall strings. Stairs may be in a straight run, leading from one floor to another without a turn or change in direction. Stairs may change direction, commonly by two straight flights connected at a 90 degree angle landing.
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