Scope and Contents From the Series: The first part of collection is comprised of papers concerning the internal affairs of the Board of Longitude, including the granting of awards, accounts, minutes, committee papers, petitions and memorials, the loan of instruments, publications and the payment of staff. These are followed by a wide range of papers relating to the Board's work, concerning clocks, chronometers and other instruments; longitude and latitude; magnetic variation; schemes and inventions; tables; pendulum...

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An invitation to dinner at the home of James Mackenzie addressed to 'My Dear Tycho' (after the famed astronomer Tycho Brahe). Various calculations and equations cover the letter.

Scope and Contents Undated photocopies of letters from Nevil Maskelyne to James Stuart Mackenzie:(1) 19 August 1790, giving Mackenzie the rule for determining the time which the Moon's semi-diameter takes to pass the meridian, 2 pages.(2) 2 November 1790, regarding the measurement of the distance of the Moon's east and west limit from the meridian, 3 pages.(3) 4 November 1790, providing additional information on a method of observing the right ascension of the Moon using the equatorial...

Scope and Contents Letters to James Bradley and other correspondence.1. Letter to Bradley on atmospheric pressure, with two examples of evidence provided by the author for his argument. There is also a piece on the origins of springs and rainfall by 'Academicus', an unknown pupil and admirer.2. Equation written on a letter to Mrs Paine of Wanstead, Essex.3. Letter to Mrs Woodom from Mathew Hymondefold, 11 October l729, informing her of the safe return home of him and his family. On the...