1817 wurde Everest zum Assistenten der Großen Trigonometrischen Vermessung Indiens unter Oberst William Lambton ernannt, der zu der Zeit sein Quartier in Hyderabad hatte. ###>Commissioned into the Royal Artillery, in 1818, Lt. Everest was appointed as assistant to Colonel William Lambton, who had started the Great Trigonometrical Survey of the subcontinent in 1806.