Return To England
On his return to England he served again with the Ordnance Survey in Southampton, where in 1856 he became director of the measurement department. Between 1861 and 1881, he lived at No. 21 Carlton Crescent, Southampton.
In 1858 he published his first article on the history of land surveying in Great Britain. On 5 June 1862, he was elected to the Royal Society. In 1866 he described a new reference ellipsoid, known as Clarke 1866 and still used today, particularly in English-language countries and areas. In his 1880 book Geodesy he described a different ellipsoid, known as Clarke 1880, which is used mainly in Africa.
In 1878, Clarke was appointed as temporary Director-General of the Ordnance Survey.
Read more about this topic: Alexander Ross Clarke
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