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Stairs are not suitable for wheelchairs and other vehicles. A stairlift is a mechanical device for lifting wheelchairs up and down stairs. For sufficiently wide stairs, a rail is mounted to the treads of the stairs, or attached to the wall. A chair is attached to the rail and the person on the chair is lifted as the chair moves along the rail.
Spandrels of a Tudor arch Spandrels of a circle within a square Spandrel figures of winged victories, Arc de Triomphe du Carrousel, Paris Spandrel panels. A spandrel [1] is a roughly triangular space, usually found in pairs, between the top of an arch and a rectangular frame, between the tops of two adjacent arches, [2] or one of the four spaces between a circle within a square.
A structural piece of stone, wood or metal jutting from a wall to carry a superincumbent weight. A corbie gable from Zaltbommel Corbiesteps A series of steps along the slopes of a gable. [17] Also called crow-steps. A gable featuring corbiesteps is known as a corbie gable, crow-step gable, or stepped gable. [18] Corinthian order
In mathematics, non-Euclidean geometry consists of two geometries based on axioms closely related to those that specify Euclidean geometry.As Euclidean geometry lies at the intersection of metric geometry and affine geometry, non-Euclidean geometry arises by either replacing the parallel postulate with an alternative, or relaxing the metric requirement.
Proportion is a central principle of architectural theory and an important connection between mathematics and art. It is the visual effect of the relationship of the various objects and spaces that make up a structure to one another and to the whole. These relationships are often governed by multiples of a standard unit of length known as a ...
In applied fields the word "tight" is often used with the same meaning. [2] smooth Smoothness is a concept which mathematics has endowed with many meanings, from simple differentiability to infinite differentiability to analyticity, and still others which are more complicated. Each such usage attempts to invoke the physically intuitive notion ...
The familiar "brick wall" tiling is not edge-to-edge because the long side of each rectangular brick is shared with two bordering bricks. [ 18 ] A normal tiling is a tessellation for which every tile is topologically equivalent to a disk , the intersection of any two tiles is a connected set or the empty set , and all tiles are uniformly bounded .
In any case, the equivalence is why this feature is not stipulated in the definition of the ideal compass. Each construction must be mathematically exact. "Eyeballing" distances (looking at the construction and guessing at its accuracy) or using markings on a ruler, are not permitted. Each construction must also terminate. That is, it must have ...