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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://en.wikipedia.org/wiki/Spiral_staircase
Helical or circular stairs do not have a central pole and there is a handrail on both sides. These have the advantage of a more uniform tread width when compared to the spiral staircase. Such stairs may also be built around an elliptical or oval planform.
https://www.atlasobscura.com/articles/spiraling-out-of-control-the-greatest-spiral-stairs-in-the-world
Oct 18, 2009 · Spiraling Out of Control: The Greatest Spiral Stairs in the World ... With no central support the stairs are said by the sisters of Loretto Chapel to be miraculous in construction. ... there is no ...
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://www.salterspiralstair.com/stairs/
Elegant exterior spiral staircase kits solution for a modern backyard Galvanized Spiral Stairs. A durable outdoor stair with a rugged, industrial appeal ... Spiral staircase kits can be built in under a day by two average homeowners and require no special tools. For added support, our team is …Location: 105 G.P. Clement Drive, Collegeville, 19426, Pennsylvania
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