222:, took up residence in Cambridge, was made a Fellow of Trinity College in 1921, received an honorary M.A. as he had no university education and in 1922 a first readership in geodesy was created for him, beginning his second career. With few funds from the University, he began, solely, teaching undergraduates and later new officers on probation for the Colonial Survey Service who spent a year at the School of Geodesy before they were posted abroad. With the assistance of Sir
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198:. New four-pendulum-based equipment to measure the gravitational force was modified to suit and, between 1903 and 1908, Lenox-Conyngham collected gravitational data across the subcontinent. The data showed a negative relative gravitational component in the region of the Plain, a fact readily apparent in modern measurements (see image).
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He retired in 1947. He died at
Addenbrooke Hospital aged 90 and his funeral service was at Trinity College Chapel. He is commemorated there by a brass plaque with a Latin inscription on the south wall of the Ante-Chapel. The translation includes: "He approved innovative ideas but also old-fashioned
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Lenox-Conyngham succeeded
Burrard as superintendent of the Great Trigonometrical Survey in 1912 and was promoted to colonel two years later. In 1918, Elsie Lenox-Conyngham was made an Officer of the Order of the British Empire and Lenox-Conyngham himself was elected Fellow of the Royal Society. The
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This 1996 gravity map of the globe clearly shows a gravitational force below the mean value (negative values are in shades of blue) in the Indian subcontinent south of the
Himalayas, as Lenox-Conyngham showed 90 years earlier. Credit: F.G. Lemoine et al., Nasa Goddard Space Flight
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A redetermination of the longitude of
Karachi undertaken by Burrard and Lenox-Conyngham in 1894, which required journeys to Europe and the Middle-East, was later found, using radio signals, to be accurate to 0.02 of a
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After his return from India in 1920, he planned to settle in Oxford but was invited to join a committee at the
University of Cambridge to promote the study of geodesy. He was delighted to be offered a
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Burrard suggested that anomalies in latitude found by the Survey in the early 1800s parallel to the mountains to the north might be caused by a large mass below the
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Sir
Alexander Frederick Bradshaw. They had one child, a daughter named Enid (born in 1892 in India; died, unmarried, in 1993 in Cambridge, England).
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to investigate earthquakes. He attended conferences worldwide and even acted as a representative of the
British government in the
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congresses of 1923 and 1926. His faculty later became the
Department of Geodesy and Geophysics (incorporated in 1980 into the
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and geothermal science to his curriculum and worked hard to secure funds and equipment. He made an expedition to the
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with whom he became firm friends, unknowingly smoothing the path for a future career at
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who, that same year, commenced an investigation into discrepancies evident in measurements of the
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375:(3 January 2008). "Conyngham, Sir Gerald Ponsonby Lenox- (1866–1956), geodesist".
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In 1890, Lenox-Conyngham married Elsie
Margaret Bradshaw, daughter of British
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Williams, W. W. (March 1957). "Colonel Sir Gerald Ponsonby Lenox-Conyngham".
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Lenox-Conyngham, Gerald (April 1929). "The Cambridge Pendulum Apparatus".
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when he was seventeen years old and passed out first with the
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Biographical Memoirs of Fellows of the Royal Society
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443:: CS1 maint: year (
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230:. He added
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270:References
248:Montserrat
232:seismology
134:lieutenant
100:, and Sir
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284:"Preface"
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