Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 692
onl). something like the submarine bell on some light-ships and buoys that, through taps on the bell,signify their proximity to ships within hearingdistance. The sound-waves from the bell struckunderneath the water are conveyed more regu-larly and distinctly than the sound-waves fromthe whistle or… … --Li, Diagram .sKowing different metKods of cominumcating witK fleet. The description of the long-distance system,which is called the superprimary system, ap-plies equally to the middle-distance, or primary,system (between 500 and 1500 miles approxi-mately) and the short-distance or secondary…
Children's literature
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