 Group of original deck prisms from my personal collection. Image by Ian.macky, via Wikimedia Commons. Licensed Public domain |
Prism GlassDeck prism Deck prism Way of transmitting light from the sun to the inside of a boat A deck prism, or bullseye, is a prism inserted into the deck of a ship to provide light down below.[1][2][3] Group of original deck prisms 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 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.[4]: 137 It required just… (Source: Wikipedia)
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