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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 ...
A door within the marble and brass pagoda conceals a spiral staircase down to a similar booth on the station's Dining Concourse. [ 20 ] [ 21 ] [ 13 ] The Main Concourse booth originally had a simple counter surrounding the enclosed staircase and clock, though by the end of 1914 the entire booth was enclosed with a glass roof, [ 22 ] and ...
The staircase proper takes the form of a barrel-vaulted colonnade that necessarily becomes narrower at the end of the vista, exaggerating the distance. Above the arch at the beginning of this vista is the coat of arms of Alexander VII, flanked by two sculpted angels. Plan of the Scala Regia
The modern 'Bramante' spiral stairs of the Vatican Museums, designed by Giuseppe Momo in 1932 The modern double helix staircase, also in the Pio-Clementine Museum, and commonly referred to as the "Bramante Staircase", was designed by Giuseppe Momo, sculpted by Antonio Maraini and realized by the Ferdinando Marinelli Artistic Foundry in 1932 and was inspired by the original Bramante Staircase.
The interior of Trajan's Column is hollow: entered by a small doorway at one side of the base, a spiral stair of 185 steps gives access to the platform above, having offered the visitor in antiquity a view over the surrounding Trajan's forum; 43 window slits illuminate the ascent. [25]
The minaret or tower was constructed in 848–852 of sandstone, and is unique among other minarets because of its ascending spiral conical design. 52 metres (171 ft) high and 33 metres (108 ft) wide at the base, the spiral contains stairs reaching to the top. [20] The height of the Malwiyyah made it practical to be used for the adhan (call to ...
The facade is segmented by pilasters in the palladian giant order, that is they continue in the building's entire height. The pilasters are of the Tuscan order with bases and capitals in sandstone. The cornice is also in sandstone but with a frieze in tiles. Between the pilasters are tall round-arched windows with clear glass and iron cames.
The alternating stairs (3) requires one unit of space per step: the same as the half-width stairs (2), and half as much as the full-width stairs (1). Thus, the horizontal distance between steps is in this case reduced by a factor of two, reducing the size of each step.
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