Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 334
eyand the battery. The entire apparatus costsabout $3.50. A push-button may be used inplace of the telegraph key. The Morse codeis used for signaling. A short flash repre-sents a dot; a longer flash, a dash. Dashesshould be longer than i-n ordinary telegraphy.The letters should be sent rapidly, but…
Children's literature
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