The First Transatlantic Telegraph Cable
On this day · 5 August 1858
For a few short weeks in 1858, a fragile copper thread on the ocean floor stitched two continents together in minutes instead of weeks.
On 5 August 1858, two ships meeting in mid-ocean finished paying out a single telegraph cable across the floor of the Atlantic. The British warship Agamemnon reached Ireland and the American frigate USS Niagara landed at Newfoundland the same day, joining roughly 2,000 nautical miles of cable laid more than two miles deep.
The project, driven by American financier Cyrus West Field, had failed repeatedly before this third attempt succeeded. Messages that once crossed by ship in ten to twelve days could now travel in hours. On 16 August, Queen Victoria exchanged greetings with President James Buchanan, sparking celebrations on both sides of the ocean.
A continent’s reply that once took weeks now arrived before nightfall.
The triumph was brief. Excessive voltage applied to boost the faint signal degraded the insulation, and within about three weeks the cable fell silent. A durable connection would not be achieved until 1866, but 1858 proved the idea possible.
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