The Transatlantic Telegraph Cable (1854-1866)
The twelve-year effort to link Europe and North America by undersea telegraph, led by American financier Cyrus Field, which collapsed in a celebrated failure in 1858 and succeeded in 1866 to create the first permanent instant communication between continents.
Events
Cyrus Field Takes Up the Project
New York businessman Cyrus West Field, consulted by telegraph engineer Frederic N. Gisborne about a line across Newfoundland, concluded the scheme could be extended across the Atlantic. He consulted Samuel Morse and oceanographer Matthew Maury, whose soundings identified a feasible plateau route between Ireland and Newfoundland, and promoted the New York, Newfoundland and London Telegraph Company to pursue the connection.
Location: New York, USA
The First Atlantic Attempt Fails
In August 1857 the warships USS Niagara and HMS Agamemnon began paying out the first transatlantic cable from Valentia Island, Ireland. The cable snapped after a few hundred miles and the attempt was abandoned. A second effort in mid-1858 saw storms nearly sink Agamemnon and two more cable breaks before the ships returned to port.
Location: Atlantic Ocean
Queen Victoria's Message and a Three-Week Triumph
On 5 August 1858 the cable was finally completed between Valentia Island, Ireland, and Trinity Bay, Newfoundland. The first official transatlantic telegram passed on 16 August: a message of congratulations from Queen Victoria to President James Buchanan. Transmission was extremely slow — Victoria's 99-word message took some 16 hours — and celebrations in the United States included fireworks that damaged New York's City Hall.
Location: Valentia Island, Ireland, and Trinity Bay, Newfoundland
The Cable Fails
After barely three weeks of erratic service the 1858 cable failed. Chief electrician Wildman Whitehouse had applied excessive voltage in an attempt to force faster signals, though a subsequent investigation found the cable's manufacture and handling were also defective. The collapse undermined public and investor confidence and delayed the project for years, while a joint British-American inquiry shaped better engineering practice for submarine cables.
The Great Eastern Loses Another Cable
In 1865 the project resumed using SS Great Eastern, by far the largest ship afloat, which could carry the entire cable in one load. More than halfway across the Atlantic the cable broke, and repeated deep-sea grappling attempts to recover the end at a depth of some 3,200 metres (10,500 feet) failed, forcing the expedition home.
Location: Atlantic Ocean
Success — Two Weeks to Two Minutes
On 13 July 1866 Great Eastern steamed west from Ireland and on 27 July landed a working cable at Heart's Content, Newfoundland, establishing permanent transatlantic telegraph service. The expedition then recovered and spliced the abandoned 1865 cable, putting two lines in service. The improvement was captured in the slogan of the time: "Two weeks to two minutes."
Location: Heart's Content, Newfoundland
The Telegraph Reshapes the Atlantic World
In the years after 1866, additional cables followed, and duplex and quadruplex transmission multiplied message capacity. News, diplomatic dispatches, and commodity prices that had crossed the Atlantic only by ship in weeks moved in minutes, tightening financial markets, shortening crises, and laying the institutional foundation for the global communications networks that followed.