| 21. | Goldingham estimated the Madras observatory at 18 17 21 E and these were used by the Trigonometrical Survey.
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| 22. | Previously to this he had made a trigonometrical survey of part of the Algarves in Portugal in 1836.
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| 23. | In the 1890s Rawnsley's Bluff was home to a trigonometrical station, supporting surveying in South Australia.
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| 24. | This was reported in'The Synoptical Volume XXXV of the Trigonometrical Survey of India'published in 1910.
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| 25. | The structure is known locally as the " Trig Tower " because trigonometrical survey readings are taken from it.
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| 26. | The title of his doctoral thesis was " Topics in the Theory of Uniqueness of Trigonometrical Series ".
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| 27. | He made extensive explorations of Gippsland, always making his land valuations after trigonometrical survey and collection of geological specimens.
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| 28. | In 1830 Bordon invented a new apparatus for accurately measuring the base line for the upcoming Massachusetts'Trigonometrical Survey.
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| 29. | It was not until 1853 That a structure was placed on the summit, a trigonometrical station, for survey purposes.
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| 30. | The Indian mathematician Radhanath Sikdar was employed as a " computer " for the Great Trigonometrical Survey of India in 1840.
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