Wired Love, Chapter 1 page 2 and 3. May be a helpful clue. For that noise, that little clatter,like, and yet too irregular to be the ticking of a clock, expressed to Nattie these four mystic letters:- “Bm – Xn;” which same four mystic letters inerpreted, meant that the name, or, to use the technical word, “call,” of the telegraph office over which she was present sole presiding genius was “Bm,” and that “Bm” was wanted by another office on the wire, designated as “Xn.”
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