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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 how to calculate longitude while at sea. Harrison's solution revolutionized navigation and greatly increased the safety of long-distance sea travel.
A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation.It is used to determine longitude by comparing Greenwich Mean Time (GMT), and the time at the current location found from observations of celestial bodies.
The marine chronometer was invented by John Harrison in 1730. This was the first of a series of chronometers that enabled accurate marine navigation. From then on, an accurate chronometer was essential to open-ocean marine or air navigation out of sight of land.
A clock or chronometer is a device that measures and displays time. ... George Graham invented the deadbeat escapement for clocks in 1720. Marine chronometer
The term chronometer was not used until the following century; [56] it would be over two centuries before this became the standard method for determining longitude at sea, John Harrison receiving an award in 1773 for solving the longitude at sea problem via his chronometer inventions. [57]
Following the Scilly naval disaster of 1707, after which governments offered a prize to anyone who could discover a way to determine longitude, Harrison built a succession of accurate timepieces, introducing the term chronometer. The electric clock, invented in 1840, was used to control the most accurate pendulum clocks until the 1940s, when ...
Friedrich Krille (1817–1863), German chronometer maker, Altona, marine chronometer, precision pendulum clock. Achille Brocot (1817–1878), French clockmaker, Paris, improvement of the Brocot escapement. Auguste Grether (1817–1879), Swiss watchmaker, Ponts-de-Martel, chronometer ebauches, tourbillon.
John Arnold (1736 – 11 August 1799) was an English watchmaker and inventor.. John Arnold was the first to design a watch that was both practical and accurate, and also brought the term "chronometer" into use in its modern sense, meaning a precision timekeeper.