Twentieth century manual of railway and commercial telegraphy (1905)
Meyer, Frederic Louis, b. 1875 · Chicago, New York, Rand, McNally & Company · leaf 35
Fig. 23. Section of a Switch-Board,showing spring-jack and phig. For further instructions on switchboards seeAppendix A. … MAl^UAL OF TELEGRAPHY. 33 PART 11. LESSON I. The Morse System of Telegraphy. The Morse alphabet, which is employed to rep-resent the sounds used in telegraphy, is composedentirely of linear characters formed of dots anddashes, and by the combination of the two: theformer being an instantaneous…
Telegraph
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