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is one of the modes of varying the appearance, so that a mariner may be able to distinguish one light from another when coming near land on a coast where the number of lights is considerable; as, for instance, the three kinds on Cape Henry and Cape Charles, at the mouth of Chesapeake Bay, and at Hog Island, on the coast of Northampton County, Virginia, about thirty miles north of Cape Charles. Lights are distinguished as — Fixed.Flashing. Revolving.Colored. Intermittent.Double. ThesCape Charles. Lights are distinguished as — Fixed.Flashing. Revolving.Colored. Intermittent.Double. These are variously combined, as: revolving white; revolving red and white; revolving red and two whites; double fixed; double revolving, etc., etc. See light ; lighthouse. See Lighthouses, their construction and illumination, by Allan Stevenson; Weale's Series, No. 47. Flash-pipe. A mode of lighting gas by means of a supplementary pipe pierced with numerous small holes throughout its length. The flash-pipe reaches from the burner to a position within reach of a person, and is provided with a