Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 58
an who devised them. Since electric lightshave come to be used on shipboard, a Spanishnaval officer, Lieutenant Ardois, has invented asystem of signals consisting of a string of lampsseveral feet apart on an electric cable stretch-ing from the masthead to the ships rail. Eachlamp is double, one… … DANGER AHEAD 574 WHAT THE LIGHTS TELL. [May, red spots representing different combinationsof these lights are grouped together, and eachgroup represents a letter of the alphabet, apoint of the compass, a number, or a word. Aswitch on the disk can be used to turn on dif-
Children's literature
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