Marine chronometer - Wikipedia
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.
Harrison's Marine Chronometer - World History Encyclopedia
2023年3月14日 · 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 ...
The Chronometer | Time and Navigation - Smithsonian Institution
Marine chronometers are precise, specialized clocks for finding longitude at sea. They serve as portable time standards.
What Makes a Sea Chronometer So Precise? | Time and Navigation
Marine chronometers are key-wound, spring-driven timekeepers that are more precise than most others mainly because of several special features: MAINSPRING ARRANGEMENT – Combines the spring with a fusee to equalize the force of the spring as it unwinds.
John Harrison - Wikipedia
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.
Marine Chronometers: Clocks Which Changed the Course of …
2020年11月13日 · The invention of accurate marine chronometers—by an Englishman named John Harrison—changed the course of seafaring and navigation forever. How much do you know about the fascinating history behind the sea clock that changed history?
Invention, Time, and Navigation | Lemelson Center for the Study …
2014年6月2日 · The problem of finding longitude at sea was finally solved in the 18th century with the invention of a seaworthy precision clock known as the marine chronometer (popularized by Dava Sobel's book, Longitude).
The Chronometers of John Harrison and the Problem of …
2019年4月3日 · Harrison invented the marine chronometer, a long-sought-after device for solving the problem of calculating longitude while at sea. However, it was not until toward the end of his life that he finally received recognition and a reward from the British Parliament.
The Marine Chronometer and its use on board ships - Bright Hub Engineering
The Marine Chronometer revolutionised celestial navigation at sea. Harrison's invention, followed by Cook's voyage changed safety of navigation forever.
The History of the Chronometer | Marine Chronometers at …
2017年12月21日 · A newly researched history of the marine chronometer, from its earliest origins in the 17th century through to electronic instruments manufactured in the late 20th century.
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