WORLDKINGS - On This Day - July 27, 2021 - 1st permanent transatlantic telegraph cable completed, in 1866


( The first permanent transatlantic telegraph cable was successfully completed, stretching from Valentia Island, Ireland, to Heart's Content, Newfoundland, on July 27, 1866.



The completion was no easy feat. Indeed, the first attempt at such a cable, made in August 1858, worked for a mere three weeks. In those weeks, signal quality declined rapidly, slowing transmissions to an almost unusable speed. Part of the speed issue stemmed from the fact that the original cables were not fitted with repeaters, which would have amplified the signal along the way, because there was no practical way to power the relays.



In September 1858, the cable was destroyed when excessive voltage was applied to it in an effort to achieve the desired speed increase. Premature failure was almost guaranteed, as the cable was plagued by faulty manufacturing, storage, and handling. Complicating matters was the basic lack of communication between the chief engineers and their teams, working separately on the two shores.



The second attempt, made in August 1865, was successfully completed in July 1866. The 1866 cable supported transmission at eight words per minute – 80 times faster than the 1858 cable.



This initial success brought an abundance of additional cables, increasing communications and making the world a much smaller place. By the end of the 19th century, British-, French-, German-, and American-owned cables linked Europe and North America in a web of telegraphic communications.



According to EDN


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