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Glass is a wholly recyclable material. [2] Glass is beloved by architects as well as designers. Glass can play a role in accomplishing greater indoor environmental quality and when used carefully can improve energy efficiency, however a measured approach needs to be taken to ensure the building loads are not excessively increased due to solar gain.
A deck prism, or bullseye, is a prism inserted into the deck of a ship to provide light down below. [1] [2] [3] For centuries, sailing ships used deck prisms to provide a safe source of natural sunlight to illuminate areas below decks. Before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps—all dangerous
Deck prisms carried light through the upper decks of ships and spread it in the decks below. Similarly, on land, prisms in sidewalk lights were used to light basements and vaults. Prism tiles were used vertically, usually as a transom light above a window or door. [6] They were also built into fixed and movable canopies, sloped glazing, and ...
Rockwell vault light, with one large piece of glass [16] Sidewalk prisms developed from deck prisms, which were used to let light through the decks of ships. The earliest pavement light (Rockwell, 1834) [16] used a single large round glass lens set in an iron frame. The large lens was directly exposed to traffic, and if the lens broke, a large ...
Prism glass can be found on sidewalks, where it is known as vault lighting, [15] in windows, partitions, and canopies, where it is known as prism tiles, and as deck prisms, which were used to light spaces below deck on sailing ships. It could be highly ornamented; Frank Lloyd Wright created over forty different designs for prism tiles. [16]
Glass was used in mosaics as early as 2500 BC, but it was not until the 3rd century BC that innovative artisans in Greece, Persia, and India created glass tiles.. Whereas clay tile is dated as early as 8,000 BC, there were significant barriers to the development of glass tile, including the high temperatures required to melt glass and the complexities of annealing glass curves.
In a prism, the angle of deviation (δ) decreases with increase in the angle of incidence (i) up to a particular angle.This angle of incidence where the angle of deviation in a prism is minimum is called the minimum deviation position of the prism and that very deviation angle is known as the minimum angle of deviation (denoted by δ min, D λ, or D m).
Later tiles have been made from materials such as concrete, glass, and plastic. Roof tiles can be affixed by screws or nails, but in some cases historic designs utilize interlocking systems that are self-supporting. Tiles typically cover an underlayment system, which seals the roof against water intrusion. [1]
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