Popular Science Monthly/Volume 3/May 1873/Ocean-Cables

Popular Science Monthly/Volume 3/May 1873/Ocean-Cables

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사이트 이름 Popular Science Monthly/Volume 3/May 1873/Ocean-Cables
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A terrific cause of damage to cables is the corrosion of the exterior wires, attributable to moving water or marine vegetation, and many others., and this has established the general practice of masking the exterior wires with tarred yarn saturated with a mixture of pitch and silica. The conductors consist of slotted tubes 1 inch in bore supported on posts 18 ft high and stayed by wires at intermediate points to keep them from sagging. The first cable ever manufactured with due regard to the principle of careful supervision, testing under water, and being retained quietly in that condition till it was laid, was the Malta and Alexandria cable, laid in 1861. This cable was submerged in too shallow water, for many miles in less depth than 20 fathoms; the consequence was the frequent recurrence of fracture from being rolled about by the surf, and yet this cable was only lastly abandoned final yr; not as a result of it couldn't be stored in restore, but because it was too expensive to maintain in order. These and many other examples have established the principle that no cable needs to be laid without first obtaining an accurate survey of the approach to the coast and landing-places, with accurate soundings over the supposed route, and as a lot knowledge as potential of the character of the underside.

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