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- Deck_prism abstract "A deck prism is a prism inserted into the deck of a ship to provide light down below.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 aboard a wooden ship. The deck prism was a clever solution: laid flush into the deck, the glass prism refracted and dispersed natural light into the space below from a small deck opening without weakening the planks or becoming a fire hazard. In normal usage, the prism hangs below the overhead and disperses the light sideways; the top is flat and installed flush with the deck, becoming part of the deck. A plain flat glass window would just form a single bright spot below—not very useful for general illumination—hence the prismatic shape. Aboard colliers (coal ships), prisms were also used to keep check on the cargo hold; light from a fire would be collected by the prism and be made visible on the deck even in daylight.The names "deck light", "dead light" or "deadlight" are sometimes used, though the latter is uncommon as a reference to prisms, as more often refers to non-opening plain-glass panels. Deadlights were commonplace for lighting underground vaults in the 19th century, in which application they were also called "vault lights"".
- Deck_prism thumbnail Group_of_Deck_Prisms.jpg?width=300.
- Deck_prism wikiPageID "19937477".
- Deck_prism wikiPageRevisionID "606417129".
- Deck_prism hasPhotoCollection Deck_prism.
- Deck_prism subject Category:Prisms.
- Deck_prism subject Category:Shipbuilding.
- Deck_prism type Abstraction100002137.
- Deck_prism type Attribute100024264.
- Deck_prism type Polyhedron113883885.
- Deck_prism type Prism113884511.
- Deck_prism type Prisms.
- Deck_prism type Shape100027807.
- Deck_prism type Solid113860793.
- Deck_prism comment "A deck prism is a prism inserted into the deck of a ship to provide light down below.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 aboard a wooden ship.".
- Deck_prism label "Deck prism".
- Deck_prism sameAs m.04yd8pk.
- Deck_prism sameAs Q5249274.
- Deck_prism sameAs Q5249274.
- Deck_prism sameAs Deck_prism.
- Deck_prism wasDerivedFrom Deck_prism?oldid=606417129.
- Deck_prism depiction Group_of_Deck_Prisms.jpg.
- Deck_prism isPrimaryTopicOf Deck_prism.