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The letter gives instructions on observations to be taken on board ship, details of observations to be taken on shore, general directions and an inventory of required instruments, books and charts.

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Concerning the focal length of a 6 foot telescope.

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Letter forwarding details of lunar occultations, with notes and calculations on an eclipse.

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Letter on occultations of stars and a solar eclipse. There are notes on Stephen Groombridge's circle on the reverse.

Scope and Contents From the Series: The collection comprises a large series of observations, calculations, computations and tables, with accounts, booklets, illustrations, journals of voyages, notes, treatises and other material. There is a large volume of correspondence, which reflects the varied nature of the Astronomer Royal's work, and includes correspondence with computers and comparers; letters from Gauss, Piazzi, Zach and Olbers, who contacted Maskelyne at the time of the discovery of the minor planets; and...

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Letter requesting Nevil Maskelyne to attend the election of a Professor of Chemistry at the University of Cambridge.

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Letter regarding the circumstances of the eclipse of 25 July 1767 mentioned in the previous letter at [RGO 4/187: 2].

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The letter requests Nevil Maskelyne to communicate to Captain Mudge anything he should discover in a paper, relative to a Trigonometrical Survey, that requires explanation. Also contain a series of equations by Maskelyne.

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Covering letter sent with two enclosed papers (non-extant) requesting Maskelyne to return the papers with any remarks he may be pleased to make. The letter is covered with Maskelyne's calculations and sketches.

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The letter is primarily concerned with the progress of 'A Mathematical and Philosophical Dictionary' upon which Charles Hutton was working. Various calculations and equations cover the reverse page of the letter.

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The letter is concerned with Simpson's method for computing series.

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The letter conveys observations of a solar eclipse made by Ali-Beik Abd-Allah at Tangier on 16 August 1803.

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Letter containing calculations for the occultations of stars.

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The letter refers to trouble Maskelyne has had with a watch belonging to a friend of Merdbey. On the reverse are various equations in Maskelyne's hand.

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The letter contains observations of the first and second satellites of Jupiter in 1803.

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The letter confirms the accuracy of the French tables, with equations on the ellipsis overleaf in Maskelyne's hand.

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Letter forwarding an account of a solar eclipse of 25 July 1767 observed by Captain Wallis from HMS 'Dolphin' in Port Royal Harbour, King George's Island (Tahiti). See also [RGO 4/187: 3].

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Concerning observations from a voyage of HMS Providence.

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Concerning observations from a voyage of HMS Providence.

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Sent from New South Wales, concerning observations from a voyage of HMS Providence.

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Letter sent to Nevil Maskelyne from HMS Investigator at Port Jackson, concerning observations he had made on the voyage; for the observations, see [RGO 14/68: 15-16].

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Letter directing and thanking Maskelyne for assisting with settling the accounts of the late husband of Mary Edwards (John Edwards) with a number of London instrument makers, and for transporting her husband's instruments back and forth for sale. The reverse of the letter is covered in notes and sketches.

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Letter containing observations of the stars and Jupiter's satellites to determine the longitude of Barbados.

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The letter is concerned with timekeepers and also contains notes and calculations in Maskelyne's hand.

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Concerning his proposed method of finding longitude by observing the pointers of the Great Bear. An annotation on the final page reads 'Ordered by the Board that no notice be taken of this letter'. Sent from Millton by Dumbarton.