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Lambton, William (1753x69–1823), army officer and geodesist in India, was born at Crosby Grange, near Northallerton, in the North Riding of Yorkshire. The date of his birth is a matter of some conjecture, and he seems to have been at some pains to keep both his birth and his parentage a mystery. ...


T. G. Bonney

revised by Elizabeth Baigent

McMahon, Charles Alexander (1830–1904), army officer and geologist, born at Highgate, Middlesex, on 23 March 1830, was the son of Captain Alexander McMahon of Irish descent, formerly in the Indian service, and his wife, Ann, daughter of Major Patrick Mansell of the British army. After education at a private school, he obtained a commission in the ...


Portlock, Joseph Ellison (1794–1864), surveyor, army officer, and geologist, the only son of Captain Nathaniel Portlock (d. 1817), was born at Gosport, Hampshire, on 30 September 1794. After passing through the Royal Military Academy at Woolwich, he was commissioned second lieutenant, Royal Engineers...


Joseph Ellison Portlock (1794–1864) by Maull & Polyblank, 1850s © National Portrait Gallery, London


Riddell, Charles James Buchanan (1817–1903), army officer and geophysicist, born at Lilliesleaf, Roxburghshire, on 19 November 1817, was the third son of Sir John Buchanan Riddell, ninth baronet, and his wife, Lady Frances Marsham, eldest daughter of Charles Marsham, first earl of Romney...