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Who in history has only done one thing all his life and done it well?
John harrison, an English carpenter, spent his whole life developing clocks and watches that can measure longitude when sailing.

From 1725 to 1728, John and his brother James, both skilled carpenters, cooperated to build at least three accurate pendulum clocks, which were also made of moving parts made of oak guaiac wood and floor clocks. During this period, they developed the grating pendulum, which was the most accurate clock in the world at that time.

In particular, they are directly related to sea clocks.

Bell 1 was kept in the American Time Museum until 2000, and was auctioned after the museum closed in 2004.

Bell 2, collected in the Leeds Art Museum and Museum in West Yorkshire, England, is no longer on display, but it is planned to be permanently exhibited at the New Leeds City Museum sometime on 20 1 1.

The third bell was displayed at the Clockmaker's Association.

John harrison:

John harrison, a self-taught British watchmaker (1April 3, 693-1March 24, 776), invented a precise chronograph for navigation, which is the key to accurately locate the east-west orientation of ships at sea, that is, longitude.

It revolutionized the era of great navigation and made it possible to sail safely in the open sea.

This problem is very difficult, and the British Parliament has provided a prize of 20,000 pounds for it.

Harrison ranked 39th in the 100 British public poll organized by BBC in 2002.

Refer to the above? Baidu Encyclopedia-john harrison