Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 607
boys and girls of St. Nicholas Magazine. used by the Indians of this country for manyyears; and flag and torch signaling, or wigwag- ging, as it is called, is still used by the army andnavy to a certain extent. Signaling by sound, such as blowing a whistleand ringing of bells, is used generally… … FIG. 3. THE MESSAGE BEING RECEIVED ON CHEMICALLYPREPARED TAPE AT THE RECEIVING STATION. of these different methods. But in the presentarticle we shall confine ourselves to the electricalmethod. There were various methods of electric signal-ing used to a limited extent up to the time of thewonderful…
Children's literature
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