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Color Photography: John Joly
One of Ireland’s most prolific inventors, John Joly was responsible for the invention of the meldometer, which measures the melting points of minerals, the steam calorimeter for measuring specific heats, and the photometer for measuring light intensity and use of radiation for cancer treatment.
However, what he is most known for is color photography. In 1894 this Irish genius from County Offaly found a successful way of producing color photographs from a single plate. He changed the way we see the world.
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.