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A reprint of Porter and D.H. Sadler's 'The Accurate Calculation of the Apparent Places of Stars', 'Monthly Notices of the Royal Astronomical Society', Vol. 113, No. 4, pp. 455-467.

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'Comet Pons-Winnecke. Methods of combining 1927 and 1933 apparitions', a draft paper by D.H. Sadler, dated 30 March 1938, with annotations by Porter.

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'Preliminary comments on J.G.P.'s notes on "The Perturbation-of-Elements Method"', produced by Porter in connection with his work at the N.A.O. and sent to D.H. Sadler.

Scope and Contents Correspondence and papers regarding staffing issues, including the following items:Correspondence of R. Atkinson, Chief Assistant, Royal Greenwich Observatory, with I.N. Sneddon of Glasgow University, H. Spencer Jones and C. Jowsey, 1948-1949, with drafts of Atkinson's confidential letters to Dr Dyson and Professor Dee on the appointment of a second chief assistant.R. Atkinson's drafts of confidential letters to D.H. Sadler and H. Spencer Jones regarding Sadler's refusal to...

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Personal correspondence of D.H. Sadler of the Nautical Almanac Office.

Scope and Contents Personal correspondence of Robert Atkinson with various organisations, including universities, observatories, periodicals and the Inspector of Taxes at Bexhill, regarding talks, lectures, minutes of meetings, circulars, articles and papers, and income tax, including the following items:Correspondence with the Admiralty regarding consultant work for Messrs Kelvin and Hughes, 1954.Correspondence with C.W. Allen, University of London Observatory, 1958.Correspondence with...

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A letter from W.A.H. Watson, Air Ministry, to D.H. Sadler, Nautical Almanac Office, 9 March 1944, and Sadler's reply of 15 March, regarding 'The ABC of Practical Astro-Navigation' by R.K. Vandervord and whether it may have infringed Crown Copyright.

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A small set of correspondence with D.H. Sadler, N.A.O., regarding slowly convergent series.

Scope and Contents Correspondence and papers regarding eclipse expeditions to observe the annual eclipse of September 1951 and the solar eclipse of February 1952, including the following items:Letter from D.H. Sadler enclosing solar eclipse data for 1950-1954.Letter from D.C. Martin, Royal Society, concerning the expedition to Rio de Oro, 1951.R. Atkinson's correspondence with D.H. Menzel, Harvard College Observatory, regarding weather data in Africa along the eclipse...

Scope and Contents Correspondence with various individuals and societies regarding meetings, membership, papers read, etc., including the British Astronomical Society, 1949-1954; the British Astronomical Society Scottish Branch, 1953; Sir Howard Grubb, Parsons and Co. Ltd, 1952; D.A. Campbell, 1952; Professor Kopal of Manchester University, 1952; Dr G. Merton, 1952; Arthur C. Clarke, 1952; the British Interplanetary Society, 1952; the Société Chronométrique de France, 1950; Dr E.C. Bullard, National Physical...

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A letter from D.H. Sadler, Nautical Almanac Office, to H. Spencer Jones, 5 June 1946, regarding Ryde night illumination diagrams, with Spencer Jones' reply of 11 June 1946.

Scope and Contents (1) Miscellaneous foreign observatoriesLetter from R. Atkinson to Colonel Gerado Dianderas, Peru, regarding equipment for the proposed Arequipa Observatory, 1946.Correspondence with the Hong Kong Royal Observatory regarding time signals, 1946.Letter from S. Jarocinski, Warsaw, to Sir Howard Grubb, Parsons and Co. Ltd, regarding the Babia Góra Observatory, 1937.(2) Miscellaneous British observatoriesLetters from E.M. Lindsay, Armagh Observatory, to Sir...

Scope and Contents Correspondence relating to the Royal Society's committee on the post-war needs of astronomy, including the following items:Correspondence with F.J.M. Stratton, W.H.M. Greaves, H.H. Plaskett and E.A. Milne concerning an application by E.M. Lindsay for a grant to convert a telescope at Armagh to a Schmidt Camera, 1946-1947, with a copy of the application and a report by H. Spencer Jones.Correspondence with W.H.M. Greaves concerning the proposed Schmidt Camera at Edinburgh,...

Scope and Contents Correspondence regarding meetings, minutes and agenda of meetings, with other papers, relating to various Royal Society committees, including the International Relations Committee, British National Committee for Astronomy, Sub-committee on the Proposed Institute of Theoretical Astronomy, British National Committee on Space Research and the International Council of Scientific Unions. The correspondents include R. Woolley, R. Atkinson, D.H. Sadler, H. Bondi, Sir H.S.W. Massey, F. Hoyle, Sir W....

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Correspondence between the Royal Observatory, Greenwich; the Nautical Almanac Office; and the Department of Physical Research concerning a proposal for a later report on the course on numerical computation with D.H. Sadler as lecturer.

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Three pieces of correspondence between D.H. Sadler, N.A.O., and Professor Dirk Brouwer regarding automatic measurement of star positions.

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Three items of correspondence between Dr G.M. Clemence of the United States Naval Observatory and D.H. Sadler of the Nautical Almanac Office regarding the Destination Almanac.

Scope and Contents A copy of a letter from D.C. Martin to members of the British National Committee for Astronomy, 29 December 1953, asking them for their views on an attached memorandum by Redman on the proposed Southern Hemisphere Observatory before he attends a meeting in Leiden on 25 January. There are copies of the replies received from J. Jackson; W.H. McCrea, Royal Holloway College; T.G. Cowling, Leeds University; H. Spencer Jones; D.H. Sadler, H.M. Nautical Almanac Office; H.H. Plaskett, Oxford...

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A letter from H. Spencer Jones to D.H. Sadler, 25 February 1949, and Sadler's reply of 26 February, regarding the meeting of the International Astronomical Union in Copenhagen in 1946.

Scope and Contents Correspondence and papers regarding the transfer of the Royal Observatory, Greenwich, and allied departments to Herstmonceux:(1) Correspondence, memoranda, manuscript notes and plans concerning the move, 1946-1948, including the following items:Memorandum from the Civil Engineer-in-Chief's office referring to estimates of costs, the Nautical Almanac Office, the Chronometer Department and the Solar Department Building.Letters to R. Atkinson from J.T. Williams,...

Scope and Contents Official and general correspondence regarding the Nautical Almanac Office, including letters concerning equipment, staff, prices of almanacs and reports of meetings. The papers include the following items:Memorandum by D.H. Sadler regarding the 'Bicentenary of the Publication of the First Nautical Almanac', 1962.Correspondence concerning the proposed replacement of the 1201 computer, 1961.Memorandum by D.H. Sadler on the work of H.M. Nautical Almanac Office,...

Scope and Contents (1) Miscellaneous correspondence and related material concerning the Nautical Almanac Office. There are papers regarding staff finance, including concession passes issued to staff, salaries, reference sheets and data supplied by the N.A.O. to H.G. Barker, Secretary and Cashier for the Royal Observatory, for making payments. There is also correspondence regarding Hollerith equipment for the N.A.O.; telegrams from the Colonial Office regarding Greenwich Mean Time and British Summer Time in the...

Scope and Contents Correspondence and related papers concerning the Royal Astronomical Society, including the following material:(1) General correspondenceCorrespondence between Sir Harold Spencer Jones and Miss Garratt, Royal Astronomical Society, regarding the Padbury chronometer, 1949.Correspondence regarding the R.A.S. Finance Committee, 1949.Correspondence between H. Spencer Jones and Dr G. Merton regarding reductions of the Stanley Williams variable star observations,...

Scope and Contents (1) Correspondence regarding general committee business of the Royal Society, including the following items:Correspondence concerning agenda, minutes and other matters relating to the meetings of various committees, 1928-1947, including the Gassiot Committee, Soiree Committee, International Relations Committee, British National Committee, Newton Tercentenary Committee, Meteorological Research Committee, Joint Permanent Eclipse Committee, National Committee for Astronomy and the...

Scope and Contents Correspondence regarding time signals, including duration, frequency, times, coordination of signals, equipment adjustments, replies to queries regarding radio time signals, clocks and the publication of lists of signals, the discontinuation of vernier radio time signals, reception reports and maintenance. The papers include the following items:Royal Greenwich Observatory circulars on solar activity, time signal adjustments and international time signals,...