John Farey Sr.
Template:Use dmy dates John Farey Sr. (24 September 1766 – 6 January 1826) was an English geologist and writer best known for Farey sequence, a mathematical construct that is named after him.
Biography
Youth and early career
Farey was born on 24 September 1766 at Woburn in Bedfordshire to John Farey (1728–1798) and his second wife, Rachel (née Wright) (1732–1804), a Wesleyan Methodist.<ref name=":0">Template:Cite ODNB</ref> He was educated at Halifax in Yorkshire, and showed such aptitude in mathematics, drawing and surveying, that he was brought under the notice of John Smeaton (1724–1792).Template:Sfn
After his education he moved to London, where he had relatives, and worked there for a number of years, during which time he met and married, Sophia Hubert (1770–1830). While in London they had their first child John Farey Jr.<ref name="AS 2002">Alec Skempton. "Farey, Jr., John," in: A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: 1500–1830. 2002. p. 223-224</ref> They went on to have eight more children, two of whom died in infancy. One of his children, Marianne Farey, was the mother of Sophie Gengembre Anderson, the noted artist.
Land agent in Woburn and consulting surveyor in London
In 1792, Farey was appointed surveyor and land agent<ref name="AS 2002"/> to Francis Russell, 5th Duke of Bedford for his Woburn estates. After the death of the duke, Farey in 1802 moved to London, and, after first contemplating emigrating or taking a farm in the country, he settled there as a consulting surveyor and geologist.Template:Sfn
That he was enabled to take this step was due largely to his acquaintance with the geologist William Smith, who in 1801 had been employed by the duke of Bedford in works of draining and irrigation. The duke, appreciating Smith's knowledge of the strata, commissioned him in 1802 to explore the margin of the chalk-hills south of Woburn in order to determine the true succession of the strata; and he instructed Farey to accompany him. Farey has remarked that Smith was his Master and Instructor in Mineral Surveying, and his subsequent publications show how well he had profited by the teachings he received.Template:Sfn
In 1805, he succeeded the agriculturist Arthur Young as Secretary of the Smithfield Club. His surveying work took him all over the country and he was in much demand from landowners wishing to improve their estates, or exploit the minerals they held. His work on economic geology then was of importance in the burgeoning Industrial Revolution by locating new resources of coal and metal ores.
Work
Writings
Farey was a prolific writer, and Professor Hugh Torrens (see references below) has traced around 270 papers by him, quadrupling the number given by the Royal Society's Catalogue of Scientific Papers. He wrote on all manner of subjects, ranging from horticulture, geology, meteorology, metrology, currency decimalisation, music and mathematics to pacifism.
He was an important contributor to Rees's Cyclopædia with articles on canals, mineralogy, surveying and a number of the scientific and mathematical basis of sound.<ref>Template:Cite web</ref> His Canals article is the largest in the work, being some 210,000 words. He contributed similarly to the Edinburgh Encyclopedia. Various nineteenth-century biographical sources, including the Dictionary of National Biography, claimed wrongly that he wrote the Rees article on Steam. It was actually written by his son John Farey Jr.
He contributed articles on music to periodicals,<ref>Template:Cite book</ref> as well as around 350 articles on the topic for two encyclopaedias.Template:Which They concerned the mathematical relationship of note values and musical temperament. He devised a notation which allowed a sound to be expressed by the sum of three small values Σ + f + m.<ref>Template:Cite journal</ref> He made great use of the researches of Marmaduke Overend (music theorist and organist) (c1730-1790), whose manuscripts were then in the library of the Royal Institution.<ref>Template:Cite journal</ref>
In 1809, Farey met William Martin who had published work on Derbyshire fossils, to investigate whether they could create a joint geological map of Derbyshire. Martin however was too ill to meet a second time and he died the following year.<ref name=":0" />
Farey's best known work is General View of the Agriculture and Minerals of Derbyshire (3 volumes 1811–17) for the Board of Agriculture. In the first of these volumes (1811) he gave an account of the upper part of the British series of strata, and an exposition of the Carboniferous and other strata of Derbyshire. In this work, and in a paper published in the Philosophical Magazine, vol. 51, 1818, p. 173, on 'Mr Smith's Geological Claims stated', he called attention to the importance of the discoveries of William Smith.Template:Sfn
Farey sequence
Template:Main As well as being remembered by historians of geology, his name is more widely known by the Farey sequence which he noted as a result of his interest in the mathematics of sound (Philosophical Magazine, vol. 47, 1816, pp. 385–386).
Farey died in London. Subsequently, Sophia, his widow, offered his geological collection to the British Museum. The museum rejected the collection, and it was dispersed and broken up.
Selected publications
- John Farey, A General View of the Agriculture and Minerals of Derbyshire, 3 volumes 1811–17. Peak District Mines Historical Society, 1989. Reprint of 1811 Edition.<ref>Volume 1. contains an introduction by Trevor D. Ford and Hugh S. Torrens. The introduction contains a list of Farey's writings located to the date of the reprint.</ref>
- Articles, a selection
- John Farey, "canals", "mineralogy", "surveying" in: Rees's Cyclopædia
- Publications about Farey and his work
- Template:Cite book<ref>This article includes a brief family history and a family tree.</ref>
- Template:Cite journal
- Template:Cite ODNB
References
Attribution:
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