John Harrison

[[Tassaert family|P. L. Tassaert]]'s half-tone print of Thomas King's original 1767 portrait of John Harrison, located at the [[Science and Society Picture Library]], London John Harrison ( – 24 March 1776) was a self-educated English carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the problem of calculating longitude while at sea.

Harrison's solution revolutionized navigation and greatly increased the safety of long-distance sea travel. The problem he solved was considered so important following the Scilly naval disaster of 1707 that the British Parliament offered financial rewards of up to £20,000 (equivalent to £}} in ) under the 1714 Longitude Act.

In 1730, Harrison presented his first design, and worked over many years on improved designs, making several advances in time-keeping technology, finally turning to what were called sea watches. Harrison gained support from the Longitude Board in building and testing his designs. Toward the end of his life, he received recognition and a reward from Parliament. Harrison came 39th in the BBC's 2002 public poll of the 100 Greatest Britons. Provided by Wikipedia

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by Harrison, John
Published 1775
printed for the author, and sold by T. Jones, No. 138, Fetter-Lane

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by Harrison, John
Published 1775
Printed for the author, and sold by T. Jones, No. 138, Fetter-Lane

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by Harrison, John
Published 1767
Subjects: '; ...Harrison, John / 1693-1776 / Awards / Early works to 1800...

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by Harrison, John
Published 1766
printed for, and sold by the author. Sold also by Messrs. Merrills, and Fletcher and Hodson, in Cambridge; Johnson and Co. and Benj. White, in London; Hollingworth and Whittingham, at Lynn; Chase, at Norwich; Knapp, at Peterborough; Wood at Lincoln; and Green, at Bury

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by Harrison, John
Published 1763
Printed by T. and J.W. Pasham, in Black-Friars, and sold by the booksellers, in London and Westminster

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by Harrison, John
Published 1767
Printed by W. Richardson and S. Clark; and sold by John Nourse, and Mess. Mount and Page

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by Harrison, John
Published 1786
printed by J. W. Galabin, Ingram-Court, Fenchurch-Street

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by Harrison, John
Published 1785
printed by Baker and Galabin, Ingram-Court, Fenchurch-Street

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by Harrison, John
Published 1710
printed for, and sold by H. Hills, in Black-Fryars, near the Water-Side, for the benefit of the poor

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by Harrison, John
Published 1765
printed for the author, and sold by Mr. Sandby, in Fleet-Street

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by Harrison, John
Published 1794
printed for the author, and sold by J. Smith, Portsmouth-Street Lincoln's-Inn. Fields; D. I. Eaton, Newgate-Street; and may be had of all Booksellers in Town and Country. -

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by Harrison, John
Published 1767
printed for W. Sandby in Fleetstreet

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by Harrison, John
Published 1767
printed for W. Sandby in Fleetstreet

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by Harrison, John
Published 1743
printed for the author, by J. Lewis; and sold by J. Oswald

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by Harrison, John
Published 1998
Springer London

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by Aagaard, Mark
Published 2000
Springer Berlin Heidelberg
Other Authors: '; ...Harrison, John...