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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 a carpenter by trade who was self-taught in clock making. During the mid-1720s he designed a series of remarkable precision longcase clocks. These clocks achieved an accuracy of one second in a month, far better than any clocks of the time.
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 ...
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.
John Harrison's marine timekeepers are arguably the most important ever made. Visit H1, H2, H3 and H4, developed and constructed over John Harrison's life time. Learn about John Harrison, the man behind the watches. Discover why the clocks are so important and how Harrison built and tested them.
Nov 5, 2007 · Thousands of lives and the increasing fortunes of nations hung on a resolution. One man, John Harrison, in complete opposition to the scientific community, dared to imagine a mechanical solution-a clock that would keep precise time at sea, something no clock had ever been able to do on land.
Around the mid-1720s, John Harrison invented a form of maintaining power which would ensure a clock could keep accurate time without stopping or running backward during winding.
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 ...
Sep 15, 2022 · His work of inventing an accurate ship clock involved the creation of five different models, known by historians as H1 through H5. H1 was a portable version of the kind of sizable wooden clock with which he’d already made his name.
Mar 27, 2010 · This clock is part of the story of John Harrison's relentless quest to develop a practical method of determining longitude at sea, using the time difference principle.
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