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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 ...


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


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...