Alexander Ross Clarke
Col Alexander Ross Clarke FRS FRSE was a British geodesist, primarily remembered for his calculation of the Principal Triangulation of Britain , the calculation of the Figure of the Earth and one of the most important text books of Geodesy . He was an officer of the Royal Engineers employed on the Ordnance Survey.
Clarke was born in Reading, Berkshire, England onDecember 1828. His Scottish father, David Ross Clarke, had travelled to Jamaica as a young merchant and there he married Elizabeth Ann Hall, the daughter of Colonel Charles William Hall and Isabella Ann Ford, onMarch 1827 in Kingston. They came to England for the birth of Alexander but they must have returned to Jamaica very soon afterwards for Alexander would later regale his own children with stories of his childhood experiences in the colony.
Source: Wikipedia