British geographer and geodesist, George Everest led the Great Trigonometrical Survey of India in the 19th century. He carried out the precise triangulation of the Indian subcontinent — a monumental undertaking that made it possible to accurately measure the Himalayan peaks. Mount Everest, the highest mountain in the world, was named in his honour in 1865.
George Everest(1790 — 1866)
George Everest
Royaume-Uni
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Frequently asked questions
Key Facts
- 1790: born at Gwernvale, Wales
- 1823: appointed Deputy Superintendent of the Great Trigonometrical Survey of India
- 1830–1843: leads the Great Trigonometrical Survey of India as Surveyor General of India
- 1841: completes the triangulation of the meridian arc across India from south to north (2,400 km)
- 1865: the highest peak in the world is officially named Mount Everest in his honour
Works & Achievements
Everest's masterwork: the precise geodetic measurement of the Indian meridional arc over 2,400 kilometres from Cape Comorin to the Himalayas. This titanic undertaking made it possible to produce an accurate map of the subcontinent and to calculate the heights of the Himalayan peaks.
A major two-volume scientific work in which Everest sets out the methodology and results of the measurement of the Indian meridional arc. Regarded as a founding reference in modern geodesy.
A public defence of Everest's geodetic methods in response to criticism from certain members of the Royal Society. The text bears witness to the lively scientific debates that surrounded the Great Survey.
Under Everest's direction, more than 100 permanent geodetic stations were established across India. This network formed the basis for all subsequent Indian cartography and enabled the first reliable measurements of the Himalayan peaks.
Everest was the first to systematise the use of Gauss's heliotrope under tropical conditions, thereby solving the problem of visibility between distant stations. This methodological innovation was adopted by other major colonial surveys.
Anecdotes
George Everest strongly objected to having the world's highest peak named after him. In 1865, when his successor Andrew Scott Waugh proposed naming 'Peak XV' in his honor, Everest argued that his name could not be transcribed into Hindi and was unpronounceable for local populations. His protest was ignored by the Royal Geographical Society.
Everest's fieldwork in India nearly cost him his life. In 1820, he contracted malaria and other tropical diseases so severe that he was forced to return to England for several years to recover. Despite fragile health and chronic pain, he returned to India in 1830 to complete his colossal undertaking.
The theodolites used by Everest in the Great Survey were enormous instruments weighing up to 500 kilograms. Transporting them through India's jungles, rivers, and mountains required teams of twelve to twenty men. Everest thus oversaw extraordinary convoys across near-impassable terrain.
Before Everest popularized the heliotrope — an adjustable mirror that reflected sunlight — trigonometric measurements over long distances were extremely difficult in India. Thanks to this instrument, his teams could signal to one another from hill to hill across dozens of kilometers, making unprecedented accuracy possible.
The Great Trigonometrical Survey of India, which Everest took charge of in 1823, mobilized thousands of Indian workers over several decades. This titanic scientific undertaking covered more than 2,400 kilometers from Cape Comorin at the southern tip of India to the foothills of the Himalayas, constituting the largest geodetic measurement operation ever carried out at the time.
Primary Sources
The operations described in these volumes embrace a period of twenty years, during which the survey was conducted under the most trying circumstances of climate, privation, and personal danger.
The object of the trigonometrical survey is to connect by a chain of triangles the astronomical and geographical observations made at the principal stations throughout the country.
The measurement of the arc of the meridian in India has been carried to a degree of precision hitherto unattained in any other country, by means of the improved instruments and methods employed.
I may add that Everest can be written in Hindi, but it is not easy of utterance by the natives of India.
Key Places
Birthplace of George Everest on 4 July 1790, in a rural area of Wales. He received the early upbringing of a young British gentleman there before joining the East India Company.
A city in northern India at the foot of the Himalayas where Everest established the permanent headquarters of the Great Trigonometrical Survey. The site was chosen for its strategic position between the Indian plains and the Himalayan peaks, and remains the seat of the Survey of India to this day.
The administrative capital of British India, where Everest reported to the East India Company and where the administrative and financial aspects of the Survey were handled. The nerve centre of British colonial power in Asia.
The British learned society founded in 1830, of which Everest was a distinguished member and where his geodetic work was presented and recognised. It was also in London that he spent his retirement and died on 1 December 1866.
The world's highest peak (8,849 m), named "Mount Everest" in 1865 in honour of George Everest by the Royal Geographical Society. Everest himself never saw this summit up close, but his geodetic work made it possible to identify it and calculate its altitude.
Typical Objects
An instrument for measuring horizontal and vertical angles with extreme precision, designed specifically for the Survey of India. Everest had two enormous examples built, carried by teams of twenty porters across the entire subcontinent.
A steerable mirror invented by Carl Friedrich Gauss and adopted by Everest for his Indian triangulations. By reflecting sunlight across dozens of kilometres, it allowed teams scattered across the landscape to signal one another with remarkable accuracy.
A standardised 20-metre metal chain used to measure triangulation baselines on the ground. Everest paid meticulous attention to correcting for thermal expansion in order to guarantee the accuracy of his baseline measurements.
An optical instrument used to measure the altitude of celestial bodies above the horizon in order to determine latitude. Essential for the astronomical observations that anchor geodetic triangulations to absolute coordinates.
An instrument ensuring the perfect horizontality of measurements. In the precision geodesy that Everest practised, the slightest tilt of the theodolite could irrevocably distort calculations spanning hundreds of kilometres.
Registers in which observers meticulously recorded every angle, every circle reading, and every weather condition. Everest's notebooks, partly preserved in British archives, bear witness to an obsessive rigour in data collection.
Printed volumes indispensable before the age of calculators, enabling the Survey's mathematicians to convert raw angles measured in the field into precise geographical coordinates. Calculation errors had catastrophic consequences for the triangulation as a whole.
School Curriculum
Vocabulary & Tags
Key Vocabulary
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Daily Life
Morning
Everest and his teams rose before dawn to take advantage of the most stable atmospheric conditions, essential for precise optical measurements. The early hours of the day, before heat created mirages and air distortions, were devoted to theodolite observations from triangulation towers.
Afternoon
The afternoon was given over to calculations, writing up observation registers, and supervising field teams. On campaign, Everest personally checked the levelling of instruments, the correction of atmospheric refraction angles, and the consistency of measurements with already-calculated triangles.
Evening
Evenings were reserved for administrative correspondence with the authorities of the East India Company in Calcutta, for trigonometric calculations carried out by lamplight, and for nocturnal astronomical observations used to determine the latitude and longitude of stations. In camp, Everest also dictated his field notes to his assistants.
Food
In the field, Everest and his officers followed a typically British camp diet — dried meats, biscuits, tea — supplemented by local resources depending on the region being traversed. During office phases at Dehra Dun, the fare was that of a prosperous colonial officer, with meals served by Indian domestic staff.
Clothing
On duty, Everest wore the uniform of Bengal Army officers, adapted to the climate: a red coat for official ceremonies, lightweight cotton attire for fieldwork under the heat of the Deccan. A pith helmet or a wide-brimmed hat shielded him from the sun during long days of open-air observation.
Housing
In Dehra Dun, Everest resided in a spacious colonial bungalow with a veranda and gardens, typical of the housing enjoyed by high-ranking British civil servants in India. On triangulation campaigns, he lodged in heavy canvas tents or in *dak* bungalows — government rest houses scattered along the main roads of India.
Historical Timeline
Period Vocabulary
Liens externes & ressources
Références
Œuvres
Grande Trigonométrique Survey of India — Arc méridien de 2 400 km
1806–1843
An Account of the Measurement of Two Sections of the Meridional Arc of India
1830
A Series of Letters Addressed to His Royal Highness the Duke of Sussex
1839
Réseau de triangulation permanent de l'Inde
1823–1843
Introduction du héliotrope dans la géodésie tropicale
1832
