![]() The leading theory for why our fingers get wrinkly in the bath is so we can get a better grip on wet objects. Though Harrison’s original invention was complicated, delicate, and costly, his successful design led to further investigations by others and eventually to the modern marine chronometer. (The geographical mile is defined as one minute of arc along the Earth’s equator compare the nautical mile, defined as one minute of arc along any great circle route.) A timekeeper fulfilling this condition would have to keep time within three seconds per day, a standard that, at the date the reward was offered, had not been attained by the best pendulum clocks on shore. It was not until the 18th century that John Harrison, a self-taught English carpenter, invented and constructed four marine timekeepers, the fourth of which effectively won him the reward of £20,000 offered in 1714 by the British government for any means of determining a ship’s longitude within 30 geographical miles (about 34.6 miles, or 55.7 km) at the end of a six weeks’ voyage. 1/36.” Ordinary clocks were of no use at sea due to temperature changes and the ship’s motion. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!Ĭhronometer, portable timekeeping device of great accuracy, particularly one used for determining longitude at sea.Īlthough there were a couple of earlier isolated uses, the word was originally employed in 1779 by the English clock maker John Arnold to describe his sensationally accurate pocket chronometer “no.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.From tech to household and wellness products. This Time in History In these videos, find out what happened this month (or any month!) in history. ![]() #WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find. ![]()
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