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In the days before electricity, light below a vessel's deck was provided by candles, oil and kerosene lamps, all dangerous aboard a wooden ship. A clever solution for the lighting problem was the deck prism. Laid flush into the deck, small conical prisms drew light down below decks, without weakening the the deck planks.
The deck prism is an exact reproduction of Mystic Seaport's remaining original CHARLES W. MORGAN deck prism.