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John Harrison (3 April [O.S. 24 March] 1693 – 24 March 1776) was an English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of calculating longitude while at sea. Harrison's solution revolutionized navigation and greatly increased the safety of long-distance sea travel.
John Harrison was an English horologist who invented the first practical marine chronometer, which enabled navigators to compute accurately their longitude at sea. Harrison, the son of a carpenter and a mechanic himself, became interested in constructing an accurate chronometer in 1728.
Mar 14, 2023 · John Harrison (1693-1776) invented an accurate marine chronometer after several decades of research and development. While the pendulum clock had already been invented in the 17th century, a clock that could withstand the vagaries of the sea, humidity, and air temperature remained an elusive dream. Harrison's last watch, the H5 of 1770, was so accurate that mariners could finally measure their longitude wherever they were at sea. ...
John Harrison1693-1776 English Horologist Perhaps the most famous clockmaker of all time, John Harrison solved the problem of reliably calculating a ship's longitude while at sea. By designing a highly accurate clock that allowed mariners to chart their position on Earth far more precisely, Harrison solved one of the most important scientific and technological problems of the eighteenth century. Source for information on John Harrison: Science and Its Times: Understanding the Social ...
Portrait of John Harrison by James King, about 1766. A stunning technical breakthrough came when English carpenter and clockmaker John Harrison built five experimental sea clocks between 1735 and 1772. With them, he demonstrated the feasibility of accurate timekeeping at sea. His best clock tested at sea—a large, portable, silver-cased watch—kept time with an accuracy of about 1/5th of a second per day.
Aug 22, 2012 · Of international scientific importance, the Harrison Clock is only one of only three precision pendulum clocks made by John Harrison and instrumental in solv...
John Harrison (24 March 1693 – 24 March 1776) was a carpenter and watch-maker. He invented the marine Chronometer which enabled a ship to accurately know its longitude at sea (position on east-west access) His invention was critical in the development of long-distance seafaring, which was very important in the eighteenth century. Short Bio John […]
Apr 3, 2018 · John Harrison revolutionized seafaring in the 18th century by allowing sailors calculate their longitude at sea. After 7 years of tinkering, in 1735 Harrison created the marine chronometer.
John Harrison had enjoyed 20 years as the only serious contender, but by the 1760s two rival schemes had emerged that might challenge his claim. These were the use of lunar distances, and Jupiter’s satellites. Both would soon be put to the test alongside H4. Find out more about the lunar method. The destination for the new trial was to be Barbados, with Nevil Maskelyne appointed as the astronomer in charge.
Apr 3, 2018 · Harrison started work in 1755 and finished four years later. The result was a culmination of a lifetime’s work, a portable device that finally solved the question of longitude.
