Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 59
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- … SENDING UP A ROCKE IGNAL AT SEA. ferent groups in succession until a signal iscomplete. So far this Ardois System has beenused only on men-of-war, and it cannot beread more than four miles away, because at agreater distance the lights blend together. Thebest night signal-lights are those invented…
Children's literature
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