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The manuscripts in the collection consist of fifty-two letters written by thirty-seven scientists. They are arranged alphabetically by writer and date between 1677 and 1873. Among those which discuss scientific projects and topics is a letter, written in 1772, from Edward Bancroft (1744-1821) to Sir Joseph Banks (1743-1820) about preserving ships' timbers from the ravages of 'aquatic worms'. Another, 1823, from Sir John Herschel (q.v.) to Pierre Simon, Marquis de la Place (1749-1827) is concerned with Sir William Herschel's discovery of the distances and position of the double stars and the series of experiments, using binary systems, carried out by Sir John to verify the discovery. Astronomy is again the subject of a letter of 1854 from Sir George Airy (1801-1892) to Urbain Le Verrier (1811-1877) on the arrangement of an apparatus for the galvanic register of observations, simultaneously at Greenwich and Paris, for the determination of longitude. The majority of documents in this collection have, however, been collected for their autograph value. Other than the prominent scientists mentioned above, the letters include those by William Brouncker (1620-1684), 1677 and 1685; John Flamstead (1646-1719), 1695 and 1703; Nevile Maskelyne (1732-1811), 1784; Joseph Priestly (1733-1804), 1772; William Scoresby (1789-1857), 1827 and Michael Faraday (1791-1867), 1857.

Correspondence and papers relating to the Royal Society relations with the International Council of Scientific Unions (ICSU), current files contain:

a) British National Committee for Geodynamics (BNC Geodynamics) 8 files, 1970-1980

b) International Union of Geodesy and Geophysics (IUGG) 24 files, 1963-1980

c) International Union of Pure and Applied Chemistry (IUPAC) loose papers, 1980-1982

d) International Union of Radio Science (URSI) 6 files, 1968-1976

e) International Biological Programme (IBP) 4 files, 1970-1975 (but a much larger collection of IBP papers from the Society's modern records centre has been microfilmed between 2001-2005 and the originals destroyed because of their poor physical condition). The archive holds mateial relating to the International Geophysical Year (IGY), 1957-1958, particularly the establishment, administration and scientific results from the Royal Society Base at Halley Bay, Antarctica.

Papers of Sir Kenneth Mason on the Himalayas including copy of his journal on the Shaksgam expedition, 1926; copy of letter from Mason to F V Thompson, Mussoorie about a stereo plotter used in India, 3 May 1914; correspondence, 1927-1940 on the Karakoram map; calculation of rectangular co-ordinates for Shaksgam stereographic survey by A R Hinks and cuttings from the Geographical Journal relating to the Himalayas, 1927-1935.

Correspondence of Sir Edward Sabine, together with two volumes of correspondence on Terrestrial Magnetism by Sir Edward Sabine, Reverend Humphrey Lloyd and others.

Papers of Sir George Howard Darwin, 1900-1912, comprise files of printed papers and correspondence on the International Geodetic Conference held in London 1909, concerning administrative and social matters, but also letters from Gen Ardagh and SG Burrard (Survey of India).

Papers of Brian S Dyde relating to the Hydrographic Office of the Admiralty and to the hydrographic survey work of the Royal Navy, including surveyor's workbooks, 1959-1973, including astronomical observations for the position of a geodetic station on the Island of Arorae, Jun 1962; and papers relating to the history of the Hydrographic Department.

Observations by James Baillie Fraser, 1820-1821, including astronomical observations on a journey from Bushire to Tehran, 1821 and observations for latitude time and longitude from Lucknow to Bombay, 1820-1821.

Correspondence of Gen James T Walker, comprising two volumes of correspondence, 1876-1882, to Walker from correspondants in India and Europe with some draft letters from Walker, principally concerning the Survey of India and pendulum apparatus, correspondents include: G B Airey, David Gill, W J Heaviside, J Herschel, Fr. A Hirsch, Clements R Markham, T G Montgomerie, Lord Roberts, O von Stubendorf, Richard Strachey, H L Thuillier, and Colonel Henry Yule. Copies of extracts from Walker's letters, 1867-1876, from the records held in the Geodetic Branch Library, Dehra Dun, transcribed by R Phillimore, 1964.

Papers of The British Association for the Advancement of Science, 1865-1952, comprise committee Minute Book of Section E (Geography and Ethnology), 1865-1873; correspondence of the geodetic committee of Section A, 1917-1919; minutes and correspondence of a committee for the making of a popular map of the British Isles, 1921-1947; minutes, notes and correspondence of the geographical glossary committee, 1950-52; photocopies of papers resulting from the work of a committee appointed in 1947 to 'collect of the revival of Geography in the British Isles dating from the later years of the nineteenth century'. (The papers provide biographical details about academic geographers.)

Reports, observations, notes and photos of Canada by Thomas Henry Manning, 1936-1946, including descriptive report, Northern Manitoba and South-east Keewatin, 1945; descriptive report and technical report, east coast of Hudson's Bay, Ottawa Islands, etc., 1946 (duplicates of reports submitted to the Geodetic Service of Canada); astronomical observations, topological notes and rough sketch maps of Whale Point and surrounding area, 1936-1938.

Records of the Worshipful Company of Clockmakers, 1503 - 1992, including copies of charters and bye-laws; Court and committee minute books; financial accounts; lists of liverymen; registers of freemen; registers of freedom admissions; registers of apprentice bindings; papers relating to duties and taxes on clocks and watches; papers relating to patents, hallmarks and foreign imports; letter books; Clerk's papers and papers relating to charities. Please note there is no public access to Ms 2710/17-20, Ms 20384 or Ms 22353 without permission from the Company.

The collection includes a number of papers of John Harrison (1693-1776), describing his construction of longitude timekeepers and watches. These papers were catalogued at various dates from 1918 by members of Guildhall Library staff. The records include description, with plans, by John Harrison, of his first longitude timekeeper or"sea clock"; papers relating to the horological inventions of John Harrison, collected by Alexander Cumming (ca. 1732-1814), clockmaker, by virtue of his appointment by Act of Parliament to adjudicate on Harrison's explanation of the mechanisms of his longitude time keeper "H 4"; journal, 1761-6, relating to the testing of John Harrison's chronometer for the determining of longitude at sea in accordance with a statute of 12 Queen Anne, chapt. 15, by Walter Williams; essays, notes and calculations by John Harrison, and his son William Harrison; and letters mainly from William Harrison, statements, cases etc relating to the tests at sea of John Harrison's longitude watches and his efforts to win an award from the Board of Longitude. PLEASE NOTE: Permission is required from the Company for photocopies or photography of Harrison material (whether for private study or for publication). All requests for reproductions for the purposes of publication should also be referred to the Company. More information is available from staff.

IMPORTANT INFORMATION REGARDING ACCESS: These records are stored at the Guildhall Library site rather than the LMA Clerkenwell site. Researchers wishing to access these records should do so at the Guildhall Library Rare Books table. The Library is open Monday to Saturday, 9:30 to 16:45. Researchers will need to have an Archives History Card or a Library Readers Card. An archivist will be available at Guildhall Library on Thursday mornings to answer any queries.

Papers of Doctor Andrew Mackay, consisting of letters received including several from Maskelyne, 1787 to 1805, and a series, written between 1794 and 1806, by Francis Maseres (1731-1824), the mathematician. In addition, there are several papers relating to his career, a manuscript copy of 'The theory and practice of finding the longitude' and several of his printed works.