Scope and Contents Minutes of Board of Longitude meetings regarding, among other matters, discussions on John Harrison's first marine chronometer (H1); the purchase of new instruments for work on the longitude and latitude of the coasts of Britain; improvements to the reflecting telescope; Tobias Mayer's lunar motion tables; the trial of John Harrison's chronometers; errors in the tables of the satellites; Schutz's machine for finding longitude; Chistopher Irwin's marine chair; the use of lunar observations...

Scope and Contents Copies of letters written by Lady Clive to her brother Nevil Maskelyne (three letters dated 1775) and to Edmund Maskelyne (one letter dated 1766); originals are in the volume catalogued at RGO 218/9/1. Also, copies of two letters from Nevil Maskelyne to his brother Edmund (29 Dec. 1763, written from Barbados describing his observatory and experiences) and to Anthony Shepherd (written 15 Oct. 1764 on his return from Barbados, reporting his observations and thanking him for notification of the...

Scope and Contents

The undated draft letter concerns the eclipses of Jupiter's satellites and the deduction of longitude from observations made on board HMS Princess Louisa during a voyage to Barbados. Maskelyne mentions his inability to make these observations from either of Christopher Irwin's marine chairs, which he had been asked by the Commissioners of the Board of Longitude to use and give an opinion on. On the reverse are observations made by Maskelyne whilst in Barbados.

Scope and Contents

A log book by Maskelyne of a voyage to Barbados, split into three parts.