John Harrison

The Chronometers of John Harrison and the Problem of Longitude

The Chronometers of John Harrison and the Problem of Longitude

On April 3, 1693, self-educated English carpenter and clockmaker John Harrison was born. 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. Early Life Little is known about John Harrison’s early years. He was the oldest of five children, born…
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Ferdinand Berthoud and the Chronometer

Ferdinand Berthoud and the Chronometer

On March 19 1727, French horologist Ferdinand Berthoud was born. Together with his great rival, Pierre Le Roy, Berthoud contributed to the development of the chronometer in the attempt to solve the problem of determining longitude at sea. Berthoud‘s improvements to the chronometer have been largely retained in present-day designs. Becoming a Master Watch Maker Ferdinand Berthoud was born in in Plancemont, Val-de-Travers, in the Canton of Neuchâtel, Switzerland, into a distinguished…
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The Chronometers of Thomas Earnshaw

The Chronometers of Thomas Earnshaw

On February 4, 1749, English watchmaker Thomas Earnshaw was born. Earnshaw further simplified the process of marine chronometer production, making them available to the general public. He is also known for his improvements to the transit clock at the Royal Greenwich Observatory in London and his invention of a chronometer escapement and a form of bimetallic compensation balance. Improving Marine Timekeepers Thomas Earnshaw was born at Ashton under Lyne, Lancashire. He became…
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