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The papers are extensive, relating to almost every aspect of Blackett's career in science and public life. There is biographical and personal material including large numbers of letters of congratulation received on the occasion of the various scientific and public awards and honours with which Blackett's achievements were recognised. There are records of his work on particle disintegration, cosmic rays, astrophysics and magnetism in the form of laboratory notebooks, working papers, correspondence, lectures, publications and broadcasts. There is documentation of his activities on various defence projects and as a member of government committees before, during and after the Second World War. Blackett's political interests are represented by material relating to the Association of Scientific Workers, Labour Party discussion groups on science and technology policy and the Ministry of Technology instituted after the Party's 1964 electoral victory. There are records of a wide range of science-related interests such as the history of science and technology, science, education and government, and nuclear weapons and disarmament, and of his overseas activities including material relating specifically to India and that concerned with matters more generally affecting developing countries.

A few lacunae in the surviving material have been identified. There are no documents relative to Blackett's service with the National Research and Development Corporation or the Department of Scientific and Industrial Research and, of his correspondence during the Second World War, only that for 1942 survives.

Scientific and other papers sent to the Royal Society, presented at meetings of Fellows, or commissioned by the Society. They form a complementary series to the Early Letters, both of which were superseded by the Letters and Papers. Many of these items, referred to as the 'Guard Books', are duplicated in the Register Book of the Society. The classification is a simplified form of the 'Philosophical Transactions' abridgment by John Lowthorp. This arrangement was completed in 1741 by Thomas Birch. The majority of the papers in these volumes are manuscript, but a few printed documents occur throughout the series. Some of the papers are earlier in date than the grant on 15 July 1662 of the First Charter to the Society. The Committee of Trades seems to have been associated with the earlier meetings of those philosophers who subsequently became Fellows, and produced a number of practical papers, some of which were written in 1639 and which are mostly found in Volume 3(i). There are still earlier documents, mostly in Volume 25, which may have been included in the gift, in 1667, of the Arundel Library.

An ecclesiastical and astronomical calendar, together with the tables and figures of the zodiac: folding calendar on a sheet of parchment. Originally two rows, each of twenty four folds, but the first folds in the lower row ( lower if the sheet is looked at from the side containing art. 1) are missing and the first fold in the upper row has been sewn to the foot of the second fold. Three membranes were joined to make a sheet.

In both rows on one side, the calendar is in blue, red, green and black, four folds to a month. The second half of January is missing. Entries in red include Edwardii Regis and Translacio Edwardi Regis (20 March, 13 October); in black, Translacio Mildride (13 July). Each feast is illustrated by a conventional head, sideways, in coloured penwork: kings crowned, abbots tonsured etc. The ruling is in red and green inks.

On the other side, the other way up: (a) in the upper row, the sign of the zodiac in each month, followed by its occupation; (b) in the lower row, an astronomical calendar, 1 january to 15 June on 22 folds, four to a month.

(a) The January sign and occupation are missing. The December occupation came on the fold which was exposed when the sheet was closed and has been rubbed away.

(b) The first two folds were left blank.

The correspondence and papers of Thomas Gold, astrophysicist, 1920-2004. The papers that comprise this collection provide a fascinating insight into Thomas Gold's research, views and life as an academic. They relate to almost very aspect of his career from his work at the Admiralty Signal Establishment, research into the theory of hearing and controversy over his proposal that the surface of the moon would be covered with a layer of fine-grained rock powder, to his advocacy of the contentious theory that oil and gas deposits are non-biological (abiogenic) in origin and his proposal, proved correct, that microbial life exists deep beneath the earth's surface.

Letters and papers about the affairs of the Greenwich Observatory in the eighteenth and early nineteenth centuries.

Papers of the Gregory family. Volume One includes writings by Sir Isaac Newton, entitled 'Notae in Newtonii Principia Mathematica Philosophiae Naturalis' and his 'Theory of the Moon', which was incorporated in the Astronomia Physica published by the Savilian Professor of Astronomy at Oxford. Volume Two contains letters and papers of the Gregory family: David Gregory of Kinnairdie; James Gregorie; David Gregorie; and Charles Gregory (Professor of Mathematics at Edinburgh University); also including some papers of Sir Isaac Newton.

The correspondence of Sir John Frederick William Herschel, comprising three main groups of documents:
The first series comprises 19 volumes of manuscript letters sent to Herschel, with drafts of his replies (Ref: HS 1-19).

The second series comprises 16 volumes of copy letters from Herschel (Ref: HS 20-25). These are arranged in chronological order and are apparently constructed from Herschel's original letters brought together by a son, Col. John Herschel R.E., for a proposed biography and then returned to their original owners. The biography was never produced. There is some duplication between these versions of finished letters and the rough versions of the same in HS 1-19.
The third series comprises five boxes of unbound manuscript letters, copy books and listings (Ref: HS 25-28) in which there appears information on the copying project, and groups of original letters on particular topics, such as Herschel's involvement in W H F Talbot's photography patent disputes.

Copy of the diary of Sir John Herschel 1834-1870.

'The Right ascension and Polar distance brought to January 1800 of the 2500 Nebulae and Clusters of Stars', printed in the Philosophical Transactions by Sir William Herschel.

Kew Observatory Sunspot measurements from 24 January 1864 to 9 April 1872.

The correspondence of Sir John William Lubbock, providing information on a wide range of Lubbock's contemporaries, not exclusively in the field of science. The largest collections of scientific letters are from George Biddell Airy (113 letters), John George Children (128 letters), Joshua Alwyn Compton, 2nd Marquis of Northampton (98 letters), G P D de Pontecoulant (67 letters) and William Whewell (87 letters). There are smaller but no less important groups of letters from Charles Babbage, Francis Baily, Francis Beaufort, Charles Darwin, John Couch Adams, J F W Herschel, Baden Powell and W H F Talbot.

Letters of Nevil Maskelyne on astronomy.

Manuscript of a paper 'Astronomical Experiment on the Peak of Tenerife, carried out under the sanction of the Lords Commissioners of the Admiralty. By Professor C. Piazzi Smyth. Communicated by G.B.Airy, Esq., Astronomer Royal' in 'Philosophical Transactions' Volume 148 (1858) pages 465-534. Folder of drawings and watercolours, including tipped-in stereoscopic cards. Received 2 June 1857, read 18 June 1857. Last two pages in the manuscript provide an explanatory account of the photographs, how they were taken and developed, and what materials were used.