Pavement light
http://dbpedia.org/resource/Pavement_light
Pavement lights (UK), vault lights (US), floor lights, or sidewalk prisms are flat-topped walk-on skylights, usually set into pavement (sidewalks) or floors to let sunlight into the space below. They often use anidolic lighting prisms to throw the light sideways under the building. They were developed in the 19th century, but declined in popularity with the advent of cheap electric lighting. Older cities and smaller centers around the world have or have had pavement lights. Most such lights are approximately a century old, although lights are being installed in some new construction.
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Pavement light
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A wedge of glass, in cross-section a right-angled triangle hung from the shortest side, with light passing downwards through the shortest side, hitting the hypotenuse, and bouncing out near-horizontally from the third side. The top of the wedge has ridges for setting it into a frame, and some of the light misses the wedge and continues downwards.
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Two black-rimmed squares of glass. Above, one with rows of identical small prism ridges. Below, one with three pendants like those in the last image, but increasing successively in size.
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Large high-ceilinged space with round iron arches, covered in glass-dome skylights, floored with vault lights, clock central in foreground.
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Like image one, but the three different-sized prisms send the outgoing light off on parallel, not overlapping, courses.
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Large bathroom with chairs and a free-standing radiator, lit by flat skylights
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View of the underside of the vault-light floor, supported by tapered concrete beams
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A transport station with benches under a roof in the middle of a city square inset with inconspicuous rectangles of vault lights
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The outside, showing the same vault lights from above
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A bathroom lit by vault lights
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View up from track level, 2015; the vault lights are present, but concreted over
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Total internal reflection in a pendant prism
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Lenses with multiple rows of pendant prisms. Above, identical prisms; below, three dissimilar prisms sizes, for light dispersion. These lenses are armoured with malleable plastic
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Ray diagram of the three dissimilar prisms sizes, designed to avoid blocking each other's light. Each prism can also send the light in a slightly different direction for more diffuse lighting.
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The 1910 Pennsylvania Station Concourse in 1963, roofed with glass-dome skylights, floored with vault lights
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vertical
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The Westlake Square Comfort Station in Seattle, Washington, 1917
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3
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SeattleWestlake Square Comfort Station Seattle frontage 05.jpg
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Multi&3-way.jpg
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NYP LOC5.jpg
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Penn NY original floor.jpg
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SeattleWestlake Square Comfort Station Seattle frontage 01.jpg
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250
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Pavement lights (UK), vault lights (US), floor lights, or sidewalk prisms are flat-topped walk-on skylights, usually set into pavement (sidewalks) or floors to let sunlight into the space below. They often use anidolic lighting prisms to throw the light sideways under the building. They were developed in the 19th century, but declined in popularity with the advent of cheap electric lighting. Older cities and smaller centers around the world have or have had pavement lights. Most such lights are approximately a century old, although lights are being installed in some new construction.
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