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SPIRAL STAIRCASE

Spiral staircase to attic. Library Company of Philadelphia, Philadelphia, PA. Spiral stairs wind around a newel (central pole). They typically have a handrail on the outer side only, on the inner side just the central pole, and are often very steep. A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned screw-symmetrically. A tight spiral stair with a central pole is very space efficient in the use of floor area. A squared spiral stair assumes a square stairwell and expands the steps and railing to a square, resulting in unequal steps. Historic American Buildings Survey, undated (cropped and cleaned).
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Título:
SPIRAL STAIRCASE
Descripción: Ver traducción automática
Spiral staircase to attic. Library Company of Philadelphia, Philadelphia, PA. Spiral stairs wind around a newel (central pole). They typically have a handrail on the outer side only, on the inner side just the central pole, and are often very steep. A pure spiral assumes a circular stairwell and the steps and handrail are equal and positioned screw-symmetrically. A tight spiral stair with a central pole is very space efficient in the use of floor area. A squared spiral stair assumes a square stairwell and expands the steps and railing to a square, resulting in unequal steps. Historic American Buildings Survey, undated (cropped and cleaned).
Crédito:
Album / Science Source / Library of Congress
Autorizaciones:
Modelo: No - Propiedad: No
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Tamaño imagen:
3400 x 4800 px | 46.7 MB
Tamaño impresión:
28.8 x 40.6 cm | 11.3 x 16.0 in (300 dpi)
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