Telegraph engineering : a manual for practicing telegraph engineers and engineering students (1922)
Hausmann, Erich, 1886- · New York : D. Van Nostrand Company · leaf 276
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… … Fig. 5. drawn copper and galvanized iron wire are given in thefollowing table. The values of tensile strength givenin this table should not be used directly in determiningthe proportions of wire spans, but should be divided by aproper factor of safety, say 2 to 4, so that the wire may 262 TELEGRAPH…
Telegraph
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