History, theory, and practice of the electric telegraph (1866)
Prescott, George B.(George Bartlett),1830-1894 · Boston, Ticknor and Fields · leaf 419
he Society ofArts in Edinburgh,in October, 1837. The model con-sists of a woodenchest, five feet inlength and three inwidth, three feetdeep at one end,and one foot at theother. Thirty cop-per wires extendfrom end to end ofthe chest, and arekept apart fromeach other. Atone end they arefastened to a… … ALEXANDERS ELECTRIC TELEGRAPH. 401 of three feet square, -which forms the end of the chest. Underthese apertures, on the outside, are painted in black paint, upon awhite ground, the twenty-six letters of the alphabet, with thenecessary points, the colon, semicolon, and full point, and anasterisk to…
Telegraph
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