| RefNo | Title | Date |
| PB/3/1/3/4/1 | Correspondence with Sydney Chapman | June 1952 |
| PB/3/1/3/3/10 | Correspondence with Sydney Chapman following Blackett's 1947 paper on magnetism | May 1947-February 1949 |
| IM/000800 | Chapman, Sydney | October 1954 |
| MDA/C/20/9 | Correspondence on a Messel Research Fund grant to Sydney Chapman | 1938 |
| NLB/59/477 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Dr. [Sydney] Chapman, FRS | 6 October 1920 |
| RR/69/121 | Referee's report by Sydney Chapman, on a paper 'Ozonosphere temperatures under radiation equilibrium' by E H Gowan | 1 August 1946 |
| PB/3/1/3/1 | Correspondence preceding Blackett's paper of May 1947 on Magnetic Spin | 1947-1948 |
| RR/21/51 | Referee's report by Arthur Schuster, on a paper 'On the lunar diurnal variation of the Earth's magnetism at Pavlovsk and Pola (1897-1903)' by Sydney Chapman | [July 1914] |
| NLB/52/315 | Copy letter from Arthur Schuster, Secretary of the Royal Society; to Sydney Chapman Esquire | 8 November 1915 |
| RR/32/94 | Referee's report by Sydney Chapman, on a paper 'The transmission of electric waves around the Earth's surface' by Hector Munro Macdonald | 1925 |
| RR/30/32 | Referee's report by Sydney Chapman, on a paper 'The 27-day period (interval) terrestrial magnetic disturbance' by A L Cortie | [April 1924] |
| RR/27/126 | Referee's report by Sydney Chapman, on a paper 'The kinetic theory of a special type of rigid molecule' by F B Pidduck | January 1922 |
| NLB/54/673 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [Sydney] Chapman, FRS | 26 July 1917 |
| RR/32/32 | Referee's report by Sydney Chapman, on a paper 'Periodicities in European weather' by David Brunt | 26 June 1925 |
| NLB/54/668 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [Sydney] Chapman, FRS | 23 July 1917 |
| RR/24/27 | Referee's report by Herbert Hall Turner, on a paper 'The solar and lunar diurnal variations of terrestrial magnetism' by Sydney Chapman | [April 1917] |
| RR/27/101 | Referee's report by Sydney Chapman, on a paper 'The kinetic energy of electrons emitted from a hot tungsten filament' by J H Jones | October 1922 |
| NLB/54/664 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr. [Sydney] Chapman, FRS | 20 July 1917 |
| RR/26/33 | Referee's report by Sydney Chapman, on a paper 'The harmonic development of the tide-generating potential' by Arthur Thomas Doodson | [June 1921] |
| NLB/54/677 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Sir [James Hopwood] Jeans, Chairman of the Mathematics Committee and FRS | 26 July 1917 |
| RR/37/137 | Referee's report by George Clarke Simpson, on a paper 'On line-integrals of the diurnal magnetic variations' by A T Price and Sydney Chapman | March 1928 |
| RR/29/72 | Referee's report by Sydney Chapman, on a paper 'An experiment on the origin of the earth's magnetic field' by Harold Albert Wilson | August 1923 |
| RR/35/39 | Referee's report by Sydney Chapman, on a paper 'Recurrence phenomena in terrestrial magnetism' by Charles Chree and J M Stagg | May 1927 |
| RR/29/22 | Referee's report by Sydney Chapman, on a paper 'A note on the temperature of the air at great heights' by Frederick Alexander Lindemann and Gordon Miller Bourne Dobson | March 1923 |
| RR/29/20 | Referee's report by Sydney Chapman, on a paper 'On coupled pendulums' by Charles Herbert Lees | October 1923 |
| NLB/63/888 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 18 January 1923 |
| RR/30/87 | Referee's report by Sydney Chapman, on a paper 'Thermal diffusion measurements' by T L Ibbs | [November 1924] |
| RR/63/6 | Referee's report by Sydney Chapman, on a paper 'Dissociation, recombination and attachment processes in the upper atmosphere—I' by H S W Massey | September 1937 |
| RR/37/43 | Referee's report by George Clarke Simpson, on a paper 'On the theory of the Solar diurnal variation of the Earth’s magnetism' by Sydney Chapman | November 1928 |
| RR/30/20 | Referee's report by Syndey Chapman, on a paper 'On the drift of spinning projectiles' by J W Campbell | [May 1924] |
| RR/27/42 | Referee's report by Sydney Chapman, on a paper 'The reaction consequent upon the evaporation of a liquid and upon the emission of vapours from small orifices' by W G Duffield | 15 June 1922 |
| RR/69/122 | Referee's report by Sydney Chapman, on a paper 'Night cooling of the ozonosphere' by E H Gowan | 1946 |
| RR/33/114 | Referee's report by Sydney Chapman, on a paper 'The kinetic theory of surface films. Part II - Gaseous, expanded and condensed films' by Robert Kenworthy Schofield and Eric Keightley Rideal | November 1925 |
| RR/33/123 | Referee's report by Sydney Chapman, on a paper 'A class of integral equations occuring in physics' by D M Wrich and J Nicholson | 5 November 1925 |
| RR/37/93 | Referee's report by Sydney Chapman, on a paper 'The thermal conductivity of gas mixtures' by T L Ibbs and A A Hirst | 1928 |
| RR/34/50 | Referee's report by Sydney Chapman, on a paper 'Gas law based on molecular dimensions and molecular forces' by Otto Maass | 17 April 1926 |
| RR/32/117 | Referee's report by Sydney Chapman, on a paper 'The electrostatic capabilities of two spheres and of two parallel cylinders' by A Russell | March 1925 |
| RR/38/5 | Referee's report by Sydney Chapman, on a paper 'The effect of temperature on the viscosity of neon' by R S Edwards | April 1928 |
| RR/38/147 | Referee's report by Sydney Chapman, on a paper 'The forces on a body placed in a curved or converging stream of fluid' by Geoffrey Ingram Taylor | June 1928 |
| RR/34/124 | Referee's report by William Lawrence Bragg, on a paper 'On the form and energy of crystalline sodium nitrate' by J Topping and Sydney Chapman | [November 1926] |
| RR/37/42 | Referee's report by Ralph Howard Fowler, on a paper 'On the Brownian displacements and thermal diffusion of grains suspended in a non-uniform fluid' by Sydney Chapman | February 1928 |
| RR/38/148 | Referee's report by Sydney Chapman, on a paper 'A mechanical method for solving problems of flow in compressible fluids' by Geoffrey Ingram Taylor and C F Sharman | September 1928 |
| RR/35/34 | Referee's report by William Lawrence Bragg, on a paper 'A theoretical discussion of certain elastic constants of calcita and crystalling sodium nitrate' by by Sydney Chapman and A E Ludlam | May 1927 |
| RR/37/44 | Referee's report by George Clarke Simpson, on a paper 'On the variability of the quiet-day diurnal magnetic variation at Eskdalemuir and Greenwich' by Sydney Chapman and J M Stagg | 10 December 1928 |
| RR/37/100 | Referee's report by Sydney Chapman, on a paper 'A contribution to the theory of ferromagnetic crystals' by G S Mahajani | July 1928 |
| NLB/71/189 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Ralph Howard] Fowler Esq., O.B.E., FRS | 4 February 1928 |
| RR/39/83 | Referee's report by Sydney Chapman, on a paper 'The total reflexion of electric waves the interface between two media' by Hector Munro Macdonald | [February 1929] |
| RR/37/17 | Referee's report by Sydney Chapman, on a paper 'Two-dimensional potential problems concerning a single closed boundary' by W G Bickley | 25 February 1929 |
| RR/40/105 | Referee's report by Sydney Chapman, on a paper 'The pressures of gaseous mixtures. Part III' by C C Tanner and Irvine Masson | November 1929 |
| RR/39/93 | Referee's report by Sydney Chapman, on a paper 'Hamilton's Principle and the field equation' by D Meskyn | [October 1929] |
| RR/41/45 | Referee's report by Frank Watson Dyson, on a paper 'On the variability of the quiet-day diurnal magnetic variation. Part II' by Sydney Chapman and J M Stagg | January 1931 |
| RR/67/400 | Letter from Sydney Chapman, on an unnamed paper by an unknown author to the Secretary of the Royal Society | 14 February 1940 |
| RR/40/104 | Referee's report by Sydney Chapman, on a paper 'Index operatas' by W E Sumpner | 23 October 1929 |
| RR/52/106 | Referee's report by Sydney Chapman, on a paper 'The diurnal variation of magnetic disturbance in high latitudes' by J M Stagg | December 1934 |
| RR/41/44 | Referee's report by Hector Munro Macdonald, on a paper 'The electric and magnetic state of the interior of the earth, as inferred from terrestrial magnetic variations' by Sydney Chapman and A T Price | August 1930 |
| NLB/59/619 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 25 October 1920 |
| RR/35/35 | Referee's report by Frederick Alexander Lindemann, on a paper 'A theoretical discussion of certain elastic constants of calcita and crystalling sodium nitrate' by by Sydney Chapman and A E Ludlam | June 1927 |
| RR/35/33 | Referee's report by Arthur Schuster, on a paper 'On certain average characteristics of world wide magnetic disturbance' by Sydney Chapman | May 1927 |
| NLB/57/378 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr S [Sydney] Chapman, FRS | 29 October 1919 |
| RR/46/112 | Referee's report by Sydney Chapman, on a paper 'Electron scattering in helium. Absolute measurements at 90° and 45°' by Sven Werner | 12 August 1932 |
| NLB/57/554 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to unknown correspondent | 3 December 1919 |
| RR/49/139 | Referee's report by Sydney Chapman, on a paper 'On the electric charge collected by water drops falling through ionized air in a vertical electric field' by J P Gott | 25 May 1933 |
| RR/26/139 | Referee's report by Sydney Chapman, on a paper 'The dissipation of energy in permanent ocean currents, with some relations between salinities, temperatures and currents' by R O Street | [February 1921] |
| RR/38/35 | Referee's report by Sydney Chapman, on a paper 'The pressures of gaseous mixtures. II.—Helium and hydrogen, and their intermolecular forces' by C W Gibby and C C Tanner | November 1928 |
| RR/54/38 | Referee's report by Sydney Chapman, on a paper 'The temperatures and constituents of the upper atmosphere' by David Forbes Martyn and O O Pulley | December 1935 |
| RR/53/22 | Referee's report by Ernest Gold, on a paper 'The Götz inversion of intensity-ratio in zenith-scattered sunlight' by Sydney Chapman | [November 1934] |
| RR/56/115 | Referee's report by Sydney Chapman, on a paper 'Aspects of the current system producing magnetic disturbance' by J M Stagg | [May 1935] |
| NLB/67/8 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 27 September 1924 |
| NLB/61/826 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 1 November 1921 |
| NLB/61/804 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 27 October 1921 |
| NLB/62/337 | Copy letter from an unknown correspondent; to Professor [Sydney] Chapman, FRS | 27 January 1922 |
| NLB/62/374 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 2 February 1922 |
| RR/63/49 | Referee's report by Sydney Chapman, on a paper 'The Royal Society expedition to Montserrat, B.W.I. Final report' by Cecil Frank Powell | March 1937 |
| RR/69/126 | Referee's report by Sydney Chapman, on a paper 'Thermal diffusion in mixtures of the inert gases' by K E Grew | 6 September 1946 |
| RR/70/244 | Referee's report by Sydney Chapman, on a paper 'Atmospheric oscillations and the resonance theory' by K Weekes and Maurice Vincent Wilkes | 1947 |
| RR/69/262 | Letter from Sydney Chapman, on an unnamed paper by L F Richardson to Alfred Charles Glyn Egerton | 13 July 1945 |
| NLB/62/289 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 19 January 1922 |
| RR/71/255 | Referee's report by Sydney Chapman, on a paper 'A general kinetic theory of liquids. VI. The equation of state' by A E Rodriguez | 1948 |
| RR/69/125 | Referee's report by Sydney Chapman, on a paper 'A general kinetic theory of liquids. II. Equilibrium properties' by H S Green | 3 July 1940 |
| RR/69/37 | Referee's report by Sydney Chapman, on a paper 'A general kinetic theory of liquids I. The molecular distribution functions' by Max Born | 22 February 1946 |
| RR/66/8 | Referee's report by Sydney Chapman, on a paper 'Thermal diffusion in mixtures of the inert gases' by B E Atkins, R E Bastick and T L Ibbs | [May 1939] |
| RR/66/279 | Referee's report by Sydney Chapman, on a paper 'Effusion and thermal transpiration in quantum statistics' by B N Srivastava | [April 1939] |
| RR/66/13 | Referee's report by Sydney Chapman, on a paper 'The molecular fields of carbon dioxide and nitrous oxide' by R E Bastick, H R Heath and T L Ibbs | 2 October 1939 |
| RR/67/246 | Referee's report by Sydney Chapman, on a paper 'The sun’s magnetic field and the diurnal and seasonal variations in cosmic ray intensity' by L Jánossy and P Lockett | 1940 |
| RR/67/56 | Memorandum from J D Griffith Davies, Assistant Secretary of the Royal Society, on a paper 'The characteristics of thermal diffusion' by Sydney Chapman to William Lawrence Bragg | 1 October 1940 |
| NLB/62/895 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 29 May 1922 |
| RR/66/210 | Referee's report by Sydney Chapman, on a paper 'On the photo-ionization of molecules' by B D Nag Chowdhuri and K Basu | [May 1939] |
| NLB/66/689 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to [Sydney] Chapman, FRS | 19 June 1924 |
| NLB/65/587 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 23 November 1923 |
| RR/68/37 | Referee's report by Sydney Chapman, on a paper 'Critical and co-operative phenomena. VI. The neighbour distribution function in monatomic liquids and dense gases' by J Corner and John Edward Lennard-Jones | [1941] |
| NLB/64/330 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 15 March 1923 |
| RR/68/230 | Referee's report by Sydney Chapman, on a paper 'The thermal diffusion of radon gas mixtures' by G E Harrison | 18 March 1942 |
| RR/70/20 | Referee's report by Sydney Chapman, on a paper 'The basic reactions in the upper atmosphere II. The theory of recombination in the ionized layers' by David Robert Bates and Harrie Stewart Wilson Massey | 14 March 1947 |
| RR/69/17 | Referee's report by Sydney Chapman, on a paper 'The basic reactions in the upper atmosphere. I' by David Robert Bates and Harrie Stewart Wilson Massey | 17 December 1945 |
| RR/69/38 | Referee's report by Sydney Chapman, on a paper 'A general kinetic theory of liquids III. Dynamical properties' by Max Born and H S Green | 24 January 1947 |
| RR/69/263 | Letter from Sydney Chapman, on an unnamed paper by L F Richardson to Alfred Charles Glyn Egerton | 21 August 1945 |
| RR/68/31 | Letter from George Paget Thomson, to Sydney Chapman, regarding a paper 'The velocity of diffusion in a mixed gas; the second approximation' by Sydney Chapman and Thomas George Cowling | 14 March 1941 |
| NLB/65/321 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 11 October 1923 |
| RR/68/115 | Second referee's report by Sydney Chapman, on a paper 'Theory of porometers used in the study of stomatal movements in leaves' by Howard Latimer Penman | [1941] |
| RR/71/46 | Referee's report by Sydney Chapman, on a paper 'The cataphoresis of spherical, solid non-conducting particles in a symmetrical electrolyte' by F Booth | [1948] |
| RR/70/172 | Referee's report by Sydney Chapman, on a paper 'Atmospheric tides in the ionosphere. III. Lunar tidal variations at Canberra' by David Forbes Martyn | 1947 |
| RR/70/35 | Referee's report by Sydney Chapman, on a paper 'A general kinetic theory of liquids. IV. Quantum mechanics of fluids' by Max Born and H S Green | 1947 |
| NLB/64/681 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS. | 31 May 1923 |
| RR/69/10 | Referee's report by Sydney Chapman, on a paper 'On the propagation of electromagnetic waves through the atmosphere' by B K Banerjea | 22 July 1946 |
| RR/70/171 | Letter from Sydney Chapman, on a paper 'Atmospheric tides in the ionosphere. III. Lunar tidal variations at Canberra' by David Forbes Martyn to David Christie Martin, Assistant Secretary of the Royal Society | January 1947 |
| RR/69/211 | Letter from Sydney Chapman, on a paper 'The thermochemistry of carbon: valence states, heats of sublimation and energies of linkage' by L H Long and Ronald George Wreyford Norrish to J D Griffith Davies, Assistant Secretary of the Royal Society | 1 February 1946 |
| RR/71/30 | Referee's report by Sydney Chapman, on a paper 'The emission of the negative system of nitrogen from the upper atmosphere and the significance of the twilight flash in the theory of the ionosphere' by David Robert Bates | 16 October 1948 |
| RR/71/61 | Referee's report by Sydney Chapman, on a paper 'The magnetic field within the earth' by Edward Crisp Bullard | 15 December 1948 |
| RR/70/119 | Referee's report by Sydney Chapman, on a paper 'A general kinetic theory of liquids V. Liquid He II' by H S Green | 12 February 1948 |
| RR/72/50 | Referee's report by Sydney Chapman, on a paper 'Electromagnetic induction in a rotating sphere' by E C Bullard | 1949 |
| RR/32/120 | Referee's report by Sydney Chapman, on a paper 'The kinetic theory of surface films. Part I.—The surfaces of solutions' by Robert Kenworthy Schofield and Eric Keightly Rideal | 14 May 1925 |
| RR/28/5 | Referee's report by Sydney Chapman, on a paper 'Theory of the measurement of wind by shooting spheres upward' by Lewis Fry Richardson | [1922] |
| RR/32/55 | Referee's report by Sydney Chapman, on a paper 'An investigation of the air-flow pattern in the wake of an aerofoil of finite span' by Arthur Fage and L F G Simmons | 31 July 1925 |
| RR/35/141 | Referee's report by Sydney Chapman, on a paper 'The equation of state of a gaseous mixture' by John Edward Lennard-Jones and W R Cook | 17 March 1927 |
| RR/35/50 | Referee's report by Sydney Chapman, on a paper 'The constants of the magnetic dispersion of light' by Charles Galton Darwin and W H Watson | January 1927 |
| RR/32/45 | Referee's report by James Hopwood Jeans, on a paper 'The lunar diurnal magnetic variation at Greenwich and other observatories' by Sydney Chapman | January 1925 |
| NLB/66/92 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof [Sydney] Chapman, FRS | 21 February 1924 |
| NLB/66/599 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman | 3 June 1924 |
| NLB/65/434 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Horace] Lamb, FRS | 1 November 1923 |
| RR/39/27 | Referee's report by Sydney Chapman, on two papers 'A flow method for comparing the specific heats of gases part I. The experimental method' and 'A flow method for comparing the specific heats of gases. part II. The theory of the method' by Patrick Maynard Stuart Blackett, P S H Henry and Eric Keightley Rideal | [November 1929] |
| NLB/66/508 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman | 20 May 1924 |
| RR/34/102 | Referee's report by Sydney Chapman, on a paper 'A review of Mr George W Walker's magnetic survey (1915)' by Arthur Schuster | 30 March 1926 |
| NLB/66/164 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to [Sydney] Chapman, FRS | 6 March 1924 |
| RR/31/39 | Referee's report by Sydney Chapman, on a paper 'The principal constituent of the tides of the North Sea' by Joseph Proudman and Arthur Thomas Doodson | [February 1924] |
| NLB/67/123 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Dugald Clerk, KBE, FRS; also sent to [Sydney] Chapman FRS; [Frederick George] Donnan FRS; [Francis William] Aston FRS; [George Clarke] Simpson FRS; [Henry Hallett] Dale FRS; [James Hartley] Ashworth FRS; [Frederick Frost] Blackman FRS; [John Beresford] Leathes FRS | 30 October 1924 |
| NLB/66/138 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Sydney Chapman, FRS | 28 February 1924 |
| NLB/71/58 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Sydney] Chapman, FRS | 15 December 1927 |
| NLB/66/332 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman, FRS | 10 April 1924 |
| NLB/68/334 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the General Secretary of the International Union of Physics; 45 Rue d'Ulm, Paris | 20 June 1925 |
| NLB/66/623 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman, FRS | 6 June 1924 |
| NLB/68/337 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Richard [Tetley] Glazebrook, FRS | 20 June 1925 |
| NLB/66/898 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Right Honorable [Robert John Strutt] Lord Rayleigh, FRS | 11 September 1924 |
| NLB/66/726 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to [Sydney] Chapman, FRS | 27 June 1924 |
| NLB/66/843 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman | 24 July 1924 |
| NLB/66/635 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman, FRS | 10 June 1924 |
| NLB/68/335 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 20 June 1925 |
| NLB/68/291 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 12 June 1925 |
| NLB/72/318 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 4 July 1929 |
| NLB/71/916 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Augustus Edward Hough] Love, FRS | 7 December 1928 |
| NLB/73/184 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Prof. [Sydney] Chapman, FRS | 3 February 1931 |
| NLB/73/368 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir George Hadcock, K.B.E., FRS | 9 July 1931 |
| NLB/66/35 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman, FRS | 12 February 1924 |
| NLB/67/525 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 15 January 1925 |
| NLB/68/674 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Professor [Sydney] Chapman, FRS | 8 October 1925 |
| EC/1919/03 | Chapman, Sydney: certificate of election to the Royal Society | |
| RR/31/45 | Referee's report by Sydney Chapman, on a paper 'Thermodynamics of electron emission' by Owen Willans Richardson | [February 1924] |
| RR/41/43 | Referee's report by Charles Herbert Lees, on a paper 'A note on the measurement of the specific heats of gases' by Sydney Chapman | January 1930 |
| RR/39/114 | Referee's report by Sydney Chapman, on a paper 'The isotherms of hydrogen, carbon monoxide and their mixtures' by Gordon A Scott | [June 1929] |
| RR/26/68 | Referee's report by Syndey Chapman, on a paper 'Some experiments on thermal diffusion' by T L Ibbs | 26 March 1921 |
| RR/66/261 | Referee's report by Sydney Chapman, on a paper 'The steady two-dimensional radial flow of viscous fluid between two inclined plane walls' by Louis Rosenhead | 26 April 1940 |
| NLB/57/437 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Dr C [Charles] Chree, FRS | 7 November 1919 |
| RR/31/58 | Referee's report by Sydney Chapman, on a paper 'A new type of concentrated electromagnetic radiation and its bearing on the quantum theory' by George Adolphus Schott | 29 October 1924 |
| RR/68/113 | Referee's report by Sydney Chapman, on a paper 'Theory of porometers used in the study of stomatal movements in leaves' by Howard Latimer Penman | 1 September 1941 |
| RR/68/79 | Referee's report by Sydney Chapman, on two papers 'The diffusion and thermal diffusion of hydrogen-deuterium, with a note on the thermal diffusion of hydrogen-helium' by H R Heath, T L Ibbs and N E Wild, and 'Thermal diffusion in hydrogen-deuterium mixtures' by K E Grew | [March 1941] |
| NLB/66/387 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to [Robert John Strutt] Lord Rayleigh, FRS | 30 April 1924 |
| NLB/66/673 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Eddington, FRS | 17 June 1924 |
| NLB/66/669 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to [Sydney] Chapman | 17 June 1924 |
| NLB/65/43 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Lord Rayleigh [Robert John Strutt], FRS | 17 July 1923 |
| NLB/65/140 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Lord Rayleigh [Robert John Strutt], FRS | 10 August 1923 |
| RR/34/81 | Referee's report by Sydney Chapman, on a paper 'The equations applicable to simple hœmolytic reactions' by Eric Ponder | [May 1926] |
| PB/1/33/2 | Correspondence concerning the Copley Medal of the Royal Society | 1956 |
| RR/50/44 | Referee's report by Sydney Chapman, on a paper 'An electrical calculating machine' by R R M Mallock | 5 April 1933 |
| RR/55/80 | Referee's report by Sydney Chapman, on a paper 'Time-lag in a control system' by A Callender, Douglas Rayner Hartree and A Porter | October 1935 |
| RR/66/104 | Letter from John David Griffith Davies, to Sydney Chapman, regarding a paper 'The Earth's magnetic field in Southern Africa at the epoch, 1 July 1930' by E N Grindley | 7 February 1940 |
| RR/71/68 | Referee's report by Thomas George Cowling, on a paper 'The lunar atmospheric tide at twenty-seven stations widely distributed over the globe' by Sydney Chapman and K K Tschu | [1948] |
| NLB/66/720 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman | 25 June 1924 |
| NLB/66/548 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman | 29 May 1924 |
| NLB/66/804 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Prof. [Sydney] Chapman, FRS | 11 July 1924 |
| NLB/66/658 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to [Sydney] Chapman | 13 June 1924 |
| NLB/66 | New Letter Book volume 66, copy letters sent from Royal Society administration | 1 February 1924-25 September 1924 |
| NLB/66/841 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to [Robert John Strutt] Lord Rayleigh, FRS | 24 July 1924 |
| RR/28/82 | Referee's report by Sydney Chapman, on a paper 'Magnetic phenomena in the region of the south magnetic pole' by Charles Chree | 4 June 1923 |
| RR/34/54 | Referee's report by Sydney Chapman, on a paper 'Integrals of the equations of electrodynamics with an application to the electric constants of a transparent medium' by Hector Munro Macdonald | [May 1926] |
| RR/62/3 | Second referee's report by Sydney Chapman, on a paper 'On the action of ultra-violet sunlight upon the upper atmosphere' by Meghnad N Saha | [February 1937] |
| RR/68/153 | Letter from Sydney Chapman, to Alfred Charles Glyn Egerton, regarding a paper 'The summation of infinite harmonic series' by Frederick Soddy | 28 March 1941 |
| RR/62/1 | Referee's report by Sydney Chapman, on a paper 'On the action of ultra-violet sunlight upon the upper atmosphere' by Meghnad N Saha | [November 1936] |
| AP/81/14 | Unpublished paper, 'Wind waves. Visible, directional and approximately horizontal contact waves at the interface of atmospheric strata' by Catherine [Catharine] O [Octavia] Stevens | 1927-1940 |
| RR/66/285 | Letter from Sydney Chapman, to Alfred Charles Glyn Egerton, regarding a paper 'The air wave surrounding an expanding sphere' by Geoffrey Ingram Taylor | 19 December 1939 |
| AP/81/14/1 | Unpublished manuscript, 'Wind waves. Visible, directional and approximately horizontal contact waves at the interface of atmospheric strata' by Catherine [Catharine] O [Octavia] Stevens | 1927-1940 |
| AP/81/14/2 | Unpublished appendix, regarding 'Wind waves. Visible, directional and approximately horizontal contact waves at the interface of atmospheric strata' by Catherine [Catharine] O [Octavia] Stevens | 5 December 1939 |
| AP/81/14/3 | Unpublished correspondence, regarding 'Wind waves. Visible, directional and approximately horizontal contact waves at the interface of atmospheric strata' between Catherine [Catharine] O [Octavia] Stevens, H H [Harry Hemley] Plaskett, A C G [Alfred Charles Glyn] Egerton, G M B [Gordon Miller Bourne] Dobson and S [Sydney] Chapman | 5 July 1935-22 April 1940 |
| RR/66/105 | Referee's report by Sydney Chapman, on a paper 'The Earth's magnetic field in Southern Africa at the epoch, 1 July 1930' by E N Grindley | 8 February 1940 |
| RR/27/107 | Referee's report by Sydney Chapman, on a paper 'A theory of meteors, and the density and temperature of the outer atmosphere to which it leads' by Frederick Alexander Lindemann and Gordon Miller Bourne Dobson | November 1922 |
| RR/28/37 | Referee's report by Sydney Chapman, on a paper 'The motion of electrons in gases' by Harold Albert Wilson | [January 1923] |
| RR/28/39 | Referee's report by Sydney Chapman, on a paper 'The theory of diffusion viscosity and thermal conductivity of gases' by Harold Albert Wilson | [January 1923] |
| RR/29/78 | Referee's report by Sydney Chapman, on a paper 'A mathematical theory of evolution, based on the conclusions of Dr. J. C. Willis' by George Udny Yule | October 1923 |
| RR/32/44 | Referee's report by George Clarke Simpson, on a paper 'The lunar diurnal magnetic variation at Greenwich and other observatories' by Sydney Chapman | 23 January 1925 |
| RR/32/73 | Referee's report by Sydney Chapman, on a paper 'Experimental determination of the thermal conductivities of gases' by H Gregory and C T Archer | June 1925 |
| RR/32/128b | Referee's report by Sydney Chapman, on an appendix to a paper 'An investigation of the flow of air an aerofoil of infinite span' by Geoffrey Ingram Taylor, L W Bryant and D H Williams | June 1925 |
| RR/33/113 | Referee's report by Sydney Chapman, on a paper 'Atmospheric diffusion shown on a distance-neighbour graph' by Lewis Fry Richardson | November 1925 |
| RR/35/62 | Referee's report by Sydney Chapman, on a paper 'The analysis of tidal observations' by Arthur Thomas Doodson | January 1928 |
| RR/43/73 | Referee's report by Sydney Chapman, on a paper 'The field of force and the form of the carbon dioxide molecule. - Part I. Thermal diffusion in mixtures containing carbon dioxide' by T L Ibbs and A C R Wakeman | September 1931 |
| RR/45/55 | Referee's report by Ernest Gold, on a paper 'The lunar diurnal variation of atmospheric temperature at Batavia [Jakarta, Indonesia], 1866-1928' by Sydney Chapman | 12 March 1932 |
| RR/46/8 | Referee's report by Sydney Chapman, on a paper 'On the flow of electric current in semi-infinite stratified media' by Louis Vessot King | 7 September 1932 |
| RR/53/21 | Referee's report by Gordon Miller Bourne Dobson, on a paper 'The Götz inversion of intensity-ratio in zenith-scattered sunlight' by Sydney Chapman | 1 November 1934 |
| RR/60/47 | Referee's report by Sydney Chapman, on a paper 'On the temperature of the surface waters of the Irish sea' by Joseph Proudman, H Mabel Lewis and A Leslie Dennis | 16 December 1936 |
| RR/66/41 | Referee's report by Sydney Chapman, on a paper 'Seismic investigations on the Palaeozoic floor of east England' by Edward Crisp Bullard, T F Gaskell, W B Harland and C Kerr-Grant | [October 1939] |
| RR/68/32 | Memoranda, on a paper 'The velocity of diffusion in a mixed gas; the second approximation' by Sydney Chapman and Thomas George Cowling | 26 April 1941 |
| RR/73/104 | Letter from Edmund Clifton Stoner, on a paper 'The westward drift of the Earth's magnetic field' by Edward Crisp Bullard, Cynthia Freedman, H Gellman and Jo Nixon to the Assistant Secretary of the Royal Society [D C Martin] | 11 May 1950 |