";s:4:"text";s:2793:"Kendall's watch, now known as K1, was completed in 1769 and inspected in early 1770 by the same panel that had examined H4. Visit H1, H2, H3 and H4, developed and constructed over John Harrison's life time. John Harrison's timekeeping devices changed nautical history. In 1765 he was one of six experts selected by the Board of Longitude to witness the operation of John Harrison's H4, which he was subsequently asked to duplicate. John Harrison's marine timekeepers are arguably the most important ever made. You can see John Harrison’s H4 sea watch at the the National Maritime Museum in London. John Harrison’s Successful Longitude Timekeeper, H4; a Reconstruction Concerning H4, John Harrison said, “…I think I may make bold to say that there is neither any other mechanical nor mathematical thing in the world that is more beautiful, or curious in texture than this my watch or timekeeper for the Longitude…”. Also known as H4, Harrison started work on this watch after a watchmaker called John Jefferys produced a pocket watch to his specifications in 1753. Learn about John Harrison, the man behind the watches. Icon: Harrison H4 Marine Timekeeper The problem of longitude — where you are on the planet, east-west speaking — was the thorniest puzzle of the day, or really, of the 18th century. In 1714, the British government offered the huge prize of £20,000 (roughly £2 million today) to anyone who could solve the longitude problem once and for all. The first model finished by Kendall was an accurate copy of John Harrison's H4, cost £450, and is known today as K1. Versions of the H4 and H5 were made and sold to ships around the world, essentially solving the longitude problem. John Harrison died in 1776 having lived the end of his life in extreme wealth. Harrison’s original H1-H4 prototypes are on display at Flamsteed House at the Royal Observatory in Greenwich, where they are lauded for having revolutionized seafaring the world over. It also helped solve the Longitude puzzle which helped save countless lives at sea. https://timeandtidewatches.com/recommended-reading-john-harrison John Harrison’s H4 is the most important timekeeper ever made. K1. They were very expensive for the first decade and a half, with the cost of the chronometer representing about 30% of the cost of the ship. This elegant range, inspired by Harrison’s chronometer, has been handmade to the highest possible standards. Harrison's H4: John Harrison (now in his seventies) and William worked on a fifth timekeeper (H5), while Kendall made good progress on his copy of H4. In 1765, his son, William Harrison, took the fourth-generation clock — called H4, or the sea watch — for a test voyage to Jamaica. Discover why the clocks are so important and how Harrison … ";s:7:"keyword";s:34:"webull real time verification safe";s:5:"links";s:616:"Washington State 01 Electrical License,
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