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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
It was frequently used around the turn of the 20th century to provide natural light to underground spaces and areas far from windows. [14] 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 ...
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.
Crown glass is a type of optical glass used in lenses and other optical components. It has relatively low refractive index (≈1.52) and low dispersion (with Abbe numbers between 50 and 85). Crown glass is produced from alkali-lime silicates containing approximately 10% potassium oxide and is one of the earliest low dispersion glasses .
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 ...
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The riddle goes: “There is a green glass door, and some things can go through it and some things cannot.” The person posing the riddle then offers a series of pairs of items, only one item ...
One common application of dichroic prisms is in some camcorders and high-quality digital cameras. [3] A trichroic prism assembly is a combination of two dichroic prisms which are used to split an image into red, green, and blue components, which can be separately detected on three CCD arrays. A possible layout for the device is shown in the ...