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Underwater cables, cross-sections. These cables carry telegraph signals around the world across the floors of the oceans. The first commercial underwater telegraph cables were laid in 1850, with trans-Atlantic cables laid in the 1860s. The cables were of different diameters depending on the depth they were laid at. At top is the size of a landing (coastal) cable, with an intermediate cable below it. At bottom are two types of cables used in the deep parts of the oceans. Artwork from the eighth volume (second period of 1891) of the French popular science weekly 'La Science Illustree'.
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