The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 391
from the suspenders at every two feet by raw-hide slings, oneof which is shown in Fig. 363. The loop of the hide round the … AERIAL LINE CONSTRUCTION 363 hook is strengthened by a flat loop of steel, which is rivetedwith the hide by the copper rivet. Dip or Sag.—The amount which a wire falls at the centreof the span when its points of suspension are at equal heightsis called its sag or dif. There will always be some sag,…
Telephone
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