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St. Nicholas [serial] (1873)

Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 48

An illustration from St. Nicholas [serial], 1873, leaf 48
ouldinstantly appear in one of the little squaresto tell just where the trouble lay. These in-dicators to be sure look much like a hoteloffice but one watches them with a curiousinterest when you know that the lives ofthousands may depend upon them. Still another safety device which may bewatched… … Taking the Sun at Noon. instrument so connected with wires beneaththe water that the presence of a large body ofiron or steel, even at a considerable distance,is instantly recorded. There is besides ofcourse the regular wireless apparatus forsending and receiving signals over hundredsof miles of…

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