| 11. | Goldingham estimated the Madras observatory at 18 17 21 E and these were used by the Trigonometrical Survey.
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| 12. | Previously to this he had made a trigonometrical survey of part of the Algarves in Portugal in 1836.
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| 13. | In 1830 Bordon invented a new apparatus for accurately measuring the base line for the upcoming Massachusetts'Trigonometrical Survey.
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| 14. | He made extensive explorations of Gippsland, always making his land valuations after trigonometrical survey and collection of geological specimens.
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| 15. | The structure is known locally as the " Trig Tower " because trigonometrical survey readings are taken from it.
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| 16. | A trigonometrical survey which Benedict XIV soon after had made in the papal states strikingly confirmed the French geographer's results.
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| 17. | In 1856, Godwin-Austen joined the Trigonometrical Survey of India and began to work in Kashmir under Captain Thomas George Montgomerie.
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| 18. | The Indian mathematician Radhanath Sikdar was employed as a " computer " for the Great Trigonometrical Survey of India in 1840.
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| 19. | On 1 January 1878 he was appointed Surveyor General of India, retaining the office of superintendent of the great trigonometrical survey.
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| 20. | In that year he was appointed geologist to the Trigonometrical Survey; and in 1816-1818 he was president of the Geological Society.
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