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John Harrison
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John Harrison was an English joiner and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea.
Portrait by Thomas King, 1767
Portrait by Thomas King, 1767
Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7)
Henry Sully's clock (Fig.1) with escapement (Fig.2) and shipboard gimbaled suspension mechanism (Fig.7)
Harrison's first sea clock, the H1
Harrison's first sea clock, the H1
Harrison's second sea clock, the H2
Harrison's second sea clock, the H2
Marine chronometer
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A marine chronometer is a precision timepiece that is carried on a ship and employed in the determination of the ship's position by celestial navigation. It is used to determine longitude by comparing
John Harrison
…John Harrison (3 April [O.S. 24 March] 1693 – 24 March 1776) was an English joiner and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of how to calculate longitude while at sea. Harrison's solution revolutionized navigation and greatly…
A marine chronometer by Charles Frodsham of London, shown turned upside down to reveal the movement. Chronometer circa 1844–1860.
A marine chronometer by Charles Frodsham of London, shown turned upside down to reveal the movement. Chronometer circa 1844–1860.
The marine "Chronometer" of Jeremy Thacker used gimbals and a vacuum in a bell jar.
The marine "Chronometer" of Jeremy Thacker used gimbals and a vacuum in a bell jar.