| 11. | Thirty parallel lines were drawn inside the quadrant, and trigonometrical calculations were done graphically.
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| 12. | This was very similar to the instruments used in France and Britain for previous trigonometrical surveys.
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| 13. | The earliest European recorded to have ascended was James Sprent and his trigonometrical party in 1853.
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| 14. | Thanks to the advent of Global Positioning System technology, the trigonometrical station is now redundant.
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| 15. | In this capacity he made substantial contributions to the on-going Trigonometrical Survey of India.
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| 16. | John MacCulloch visited Balta in May 1820 to carry out the Trigonometrical Survey for the Ordnance Survey.
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| 17. | Drummond used the Drummond light which was employed in the trigonometrical survey of Great Britain and Ireland.
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| 18. | Their granddaughter Pauline Georgiana Plowden married Henry Haversham Godwin-Austen of the Trigonometrical Survey of India.
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| 19. | Sprent was appointed temporary assistant surveyor in August 1833 and was soon placed on the trigonometrical survey.
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| 20. | From 1968 to 1972 he was a trigonometrical calculator for the shipbuilders, then becoming a Pipework planner.
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