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Long Distance Telecommunication: The Lord Kelvin William Thomson
The forerunner to the modern Internet came just over 100 years later in 1969, but it was an Irishman who was knighted for his work in establishing the Atlantic Telegraph Cable in 1865. William Thomson, the Lord Kelvin, helped to lay the cable that stretched from Newfoundland to Valentia in County Cork.
He also had a very keen interest in the measurement of temperature and thermodynamics, which led to the scale of temperature, “The Kelvin Scale.”
Submarines: John Philip Holland
John Philip Holland, an Irish-American immigrant, was the first person to successfully launch a submarine. The first sub was named the “Fenian Ram.” By 1900 the U.S. Navy was formally commissioning the production of submarines based on Holland's design.
Cars, Tanks, Guided Missiles, Monorails & Helicopters: Sir Winston Churchill & Louis Brennan
During the First World War, Dublin-raised Winston Churchill, then Home Secretary of Great Britain, commissioned the design of a vehicle “capable of resisting bullets and shrapnel, crossing trenches, flattening barbed wire, and negotiating the mud of no-man’s land.”
That design become the precursor to the modern tank.
Another Irishman, Louis Brennan, came up with the design for the first guided missile system for coastal defense (essentially a steerable torpedo), the first functional helicopter, monorail trains and also the ejector seat. Another Irishman and engineer, James Martin, co-founded the Martin-Baker company, which to his very day produces ejector seats for military aircraft.
We probably also shouldn't forget Henry Ford, who was the American-born son of an Irishman, and invented the means of mass-producing automobiles, as well as pretty much everything else in the modern industrial age that uses an assembly line.