Seventeen letters from Captain Matthew Flinders, his brother Lieutenant Samuel Ward Flinders, the astronomer John Crosley, Captain Thomas Hurd and the Astronomer Royal, John Pond. Also included are copies of relevant minutes of the Board of Longitude, a proposal by Captain Flinders that the whole of the calculations for the voyage should be calculated, and a petition by Samuel Ward Flinders for remuneration for work he had done on the observations.

A single volume of bound letters.

A diary of work performed on the 'Nautical Almanac' and arrangements for its compilation and publication.

Miscellaneous draft letters.

The collection primarily consists of the Maunders' published works both on their research and explanatory works on astronomy for a more popular audience. Some of these publications bear annotations. There are also some notes on a variety of subjects, a pin-hole camera, a planisphere and some items of correspondence. There is supporting material in the form of obituaries, letters of condolence and subsequent published works on the Maunders and their work.

A collection of papers concerning horology and clockmaking. It includes correspondence between Ernest C. Atkinson and a range of people connected with horology and timekeeping, including Humphry Smith and other members of the RGO’s Time Department. The collection also includes pamphlets, leaflets, papers and booklets, brochures for watch sales, admiralty notices to mariners re time signals, sets of notes, graphs and calculations, and a small number of photographs of clock parts.

'To clear the distance of the Moon from a star from the effects of refraction and parallax', February 1766. The envelope includes copies of reports made to the Board of Longitude by John Howe, undated, and M. Raper of Thorley Hall, 9 July 1765, on the method of Israel Lyons and George Witchell for correcting observed distances. There are also a number of tables on the Sun's parallax.

A large set of registers recording errors of observations and adjustments to instruments; clock errors and rates; and clock comparisons with standard.

Each register contains handwritten entries on printed numbered forms.

Note: there are many gaps in the surviving record. The clock error and clock rates books, for example, have volumes only for 1806-1813, 1899-1911, 1919-1921, 1929-1940.

Four volumes of printed forms (Form No. 10) titled 'Royal Observatory, Greenwich, Computation of Mean Solar Time, in the Year 18-]'. Entries are completed by hand.

Bound volumes of printed Greenwich Heliographic Results, covering the years 1892-1957. Most contain multiple issues of printed results of measures made at the Royal Observatory, Greenwich, of photographs of the Sun taken at Greenwich, the Cape, and Kodaikanal/Mauritius, with additions such as printed ledgers of sunspot groups. The volumes are numbered 6-29. Numbers 1-5 are not extant.

An incomplete series of ING Technical Notes.

20 volumes of typed or photocopied texts bound with green covers, with 14 duplicate copies. The following abbreviations are used in the titles: ISIS: Intermediate Dispersion Spectroscopic Imaging System; LDSS: Low Dispersion Survey Spectrograph; WHT: William Herschel Telescope; INT: Isaac Newton Telescope; MPF: Multi Purpose Fotometer; ADAM: Astronomical Data Acquisition Monitor; and CCD: Charge-coupled device.

This journal is fully indexed. It contains Franklin-Adam’s work and memoranda from June 1897 to 23 June 1906. Readings and observational data form the main content. It also includes detailed accounts of adjustments and corrections to the Equatorial Telescope, Transit Circle, Azimuth, Cape Town Instruments, chronometers and clocks. A preface describes his observatory and instruments.