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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...

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