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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. ... this argument proceeds on a faulty premise that all spiral staircases need a central support. 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 ...
https://en.wikipedia.org/wiki/Spiral_staircase
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.
https://www.askthebuilder.com/loretto-staircase/
Is the Loretto Staircase a Miracle? No, the staircase is not a miracle. I'm sorry to be the one to challenge your inner ideology. If you took the staircase apart and just allowed the inner and outer stringers to stand there by themselves, they would do so like the flagpole just outdoors on the plaza, even though each stringer is made up of several pieces of wood glued and pegged together.
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