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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 Potemkin Stairs in Odesa, Ukraine. In architecture, a perron generally refers to an external stairway to a building. Curl notes three more-specific usages: the platform-landing reached by symmetrical flights of steps leading to the piano nobile of a building; the steps themselves; or the platform base of edifices like a market cross. [1]
The combination stair is a T-shaped compromise design popular in the nineteenth century that was found in some moderate-sized houses. [1] In this design, both the formal front stair and the utilitarian back stair ran to a common intermediate landing. [2] One common stair then extended from this intermediate landing to the second floor of the house.
A stair, or a stairstep, is one step in a flight of stairs. A staircase or stairway is one or more flights of stairs leading from one floor to another, and includes landings, newel posts, handrails, balustrades, and additional parts. [4] In buildings, stairs is a term applied to a complete flight of steps between two floors.
The longest spiral stair belonged to the 2nd century AD Trajan's Column in Rome. Measuring a height of 29.68 m, it surpassed its successor, the Column of Marcus Aurelius, by a mere 6 cm. Its treads were carved out ouf nineteen massive marble blocks so that each drum comprised a half-turn of seven steps.
The column is composed of 29 blocks of Luni marble, weighing in total more than 1100 t. [26] The spiral stair itself was carved out of 19 blocks, with a full turn every 14 steps; this arrangement required a more complex geometry than the more usual alternatives of 12 or 16. [29]
The 80-year-old commander-in-chief has stumbled on the stairs on more than one occasion, with the White House brushing aside questions on the issue as Mr Biden’s age is one of the main worries ...
This system is composed of a central ramp flanked by two staircases with numerous post holes, using a sled which carried a stone block and was attached with ropes to these wooden posts, ancient Egyptians were able to pull up the alabaster blocks out of the quarry on very steep slopes of 20 percent or more ...
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