Ternant, A. L. (Alcide Ludovic), 1832-1884 · London ; New York : G. Routledge and Sons · leaf 148
THE TELEGRAPH. 130 proportion as the strain of the wires is greater (fig. 71). When this strain reaches a certain limit, either on account of the great number of the wires,, or by an increase of span, or because the angle formed by the direction of the wires is too acute, posts are connected in… … apart, and props are added when required. It sometimes happens, from the shifting nature of the soil, from the necessity of avoiding the smallest displacement of the wires, and from other causes, that even these methods of obtaining firmness prove insufficient. . Eecourse is then had to stays, that…
Telegraph
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