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Such stairs may also be built around an elliptical or oval footprint, [16]: 68–72 or even a triangular or pentagonal core. Lacking a central pole, an open well staircase is supported at its outer periphery, or in some cases may be a completely self-supporting and free-standing structure.
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]
Step stools are halfway between a ladder and a stool, being used, as a support platform, for reaching targets that are at heights between approximately 2 and 3 metres (6.6 and 9.8 ft). The most common modern type is made with two separate ladders connected to each other at the upper end, where there is a platform with an area big enough to ...
The track system is built into the truss to guide the step chain, which continuously pulls the steps from the bottom platform and back to the top in an endless loop. One track guides the front wheels of the steps (called the step-wheel track) and another guides the back wheels of the steps (called the trailer-wheel track).
This is a list of tallest freestanding structures in the world past and present. To be freestanding a structure must not be supported by guy wires , the sea or other types of auxiliary support. It therefore does not include guyed masts , partially guyed towers and drilling platforms but does include towers , skyscrapers ( pinnacle height) and ...
The Belfry of Tournai (French: Beffroi de Tournai) is a freestanding bell tower of medieval origin in Tournai, Belgium, 72 metres (236 ft) in height with a 256-step stairway. This landmark building is one of a set of Belfries of Belgium and France registered on the UNESCO World Heritage List in recognition of their civic architecture and ...