Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 276
y lightning, it is common practice to lead aground wire to the top of at least every tenth pole. Fig. 4shows one arrangement employing a double-grooved in- TELEGRAPH LINES AND CABLES 261 sulator mounted on a bracket pin. It will be observedthat a small gap is formed between the ground wire andthe… … 2. Wire Spans. — In suspendingwires from pole cross-arms, the ten-sion of the wire should be such thatat the lowest attainable temperaturethe tension due to the weight ofthe wire with possible coverings of sleet and snow anddue to wind pressure must not exceed a predeterminedvalue. The physical…
Telegraph
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