Pavement light | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-04

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Pavement_light


00:01:01 1 Uses
00:03:05 2 History
00:03:49 2.1 Frames
00:06:32 2.2 Transparent elements
00:06:50 2.2.1 Glass color
00:08:10 2.2.2 Glass shape
00:09:57 2.2.3 Non-glass translucent materials
00:10:36 2.3 Structure
00:11:23 3 Current state and trends
00:11:34 3.1 Manufacture, maintenance, and repair
00:13:03 3.2 Reuse and preservation
00:14:39 3.3 Problems
00:15:15 3.4 Current installations
00:21:09 4 Gallery
00:21:18 5 See also



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SUMMARY
=======
Pavement lights - first appearing in London in the late 1880's in the form of cast iron frames glazed with cut squares of glass. Plain glass fenestration was quickly superseded by pressed glass lenses, which in turn were succeeded by pressed glass prism lenses designed to transmit as much light as possible. 

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 declined in popularity with the advent of cheap electric lighting. 
Some cities are systematically removing historic sidewalk lights; others are restoring them. Pavement lights have been used in a few new architectural designs. (see Gallery)