| Reference number | Title | Date |
| PP/13/28 | Paper, 'Recalescence of iron' by J [John] Hopkinson | 1889 |
| NLB/1/331 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 23 December 1886 |
| NLB/7/966 | Copy letter from Herbert Rix, to Messrs Harrison & Sons, St Martin's Lane | 6 June 1893 |
| NLB/3/517 | Copy letter from Herbert Rix, to Dr [John] Hopkinson, Fellow of the Royal Society | 1 July 1889 |
| NLB/3/241 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 17 April 1889 |
| NLB/3/616 | Copy letter from an unknown correspondent, to Messrs West, Newman & Company | 24 July 1889 |
| NLB/3/352 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 17 May 1889 |
| NLB/4/888 | Copy letter from Michael Foster, to Dr John Hopkinson, Fellow of the Royal Society | 19 November 1890 |
| NLB/3/357 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 20 May 1889 |
| NLB/3/513 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 1 July 1889 |
| NLB/3/530 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 4 July 1889 |
| NLB/3/610 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 23 July 1889 |
| NLB/6/182 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 19 March 1892 |
| NLB/3/954 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 23 November 1889 |
| NLB/3/1022 | Copy letter from Herbert Rix, to Dr John Hopkinson, [Fellow of the Royal Society] | 13 December 1889 |
| NLB/6/839 | Copy letter from Herbert Rix, to Messrs Harrison & Sons | 21 July 1892 |
| NLB/8/141 | Copy letter from Theodore E James, to Dr John Hopkinson, Fellow of the Royal Society | 20 July 1893 |
| NLB/7/711 | Copy letter from Herbert Rix, to Mr Collings | 13 April 1893 |
| NLB/10/230 | Copy letter from Herbert Rix, to Mr Collings | 26 October 1894 |
| NLB/10/193 | Copy letter from an unknown correspondent, to Mr Collings | 19 October 1894 |
| NLB/8/571 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 17 November 1893 |
| NLB/11/109 | Copy letter from Herbert Rix, to Dr [John] Hopkinson, Fellow of the Royal Society | 22 April 1895 |
| NLB/10/617 | Copy letter from Herbert Rix, to C Camme, Lead Mill Steel Works, Sheffield | 3 January 1895 |
| NLB/11/186 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 10 May 1895 |
| NLB/10/864 | Copy letter from an unknown correspondent, to Messrs Dulau & Company | 21 February 1895 |
| NLB/10/863 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 21 February 1895 |
| NLB/11/50 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 6 April 1895 |
| NLB/11/79 | Copy letter from Herbert Rix, to Lord Rayleigh [John William Strutt] | 11 April 1895 |
| NLB/14/442 | Copy letter from Arthur William Rucker, to Dr John Hopkinson, Fellow of the Royal Society | 12 March 1897 |
| NLB/13/94 | Copy letter from Robert William Frederick Harrison, to Dr John Hopkinson, Fellow of the Royal Society | 8 June 1896 |
| NLB/12/166 | Copy letter from Herbert Rix, to Lord Rayleigh [John William Strutt], Secretary, Royal Society | 23 December 1895 |
| NLB/12/65 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 2 December 1895 |
| NLB/12/129 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 12 December 1895 |
| NLB/14/192 | Copy letter from an unknown correspondent, to Mr Collings, Surrey Chambers, 172 Strand, W.C. | 20 January 1897 |
| NLB/14/200 | Copy letter from Arthur William Rucker, to Professor John Ambrose Fleming, Fellow of the Royal Society | 20 January 1897 |
| NLB/14/295 | Copy letter from Robert William Frederick Harrison, to Dr John Hopkinson, Fellow of the Royal Society | 11 February 1897 |
| NLB/14/490 | Copy letter from Robert William Frederick Harrison, to Dr John Hopkinson, Fellow of the Royal Society | 18 March 1897 |
| NLB/14/526 | Copy letter from Robert William Frederick Harrison, to Dr John Hopkinson, Fellow of the Royal Society | 24 March 1897 |
| NLB/17/208 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 30 August 1898 |
| NLB/17/526 | Copy letter from Robert William Frederick Harrison, to Captain William de Wiveleslie Abney, Fellow of the Royal Society | 14 November 1898 |
| NLB/18/480 | Copy letter from Robert William Frederick Harrison, to Professor Ewing, Fellow of the Royal Society | 17 March 1899 |
| NLB/18/513 | Copy letter from Robert William Frederick Harrison, to B Hopkinson, 26 Victoria Street, S.W. | 24 March 1899 |
| RR/7/451 | Referee's report by James Clerk Maxwell, on a paper 'The residual charge of the Leyden jar' by John Hopkinson | 1876 |
| RR/9/283 | Referee's report by George Carey Foster, on a paper 'Magnetisation of iron' by John Hopkinson | 30 July 1885 |
| RR/7/450 | Referee's report by George Carey Foster, on a paper 'The residual charge of the Leyden jar' by John Hopkinson | 14 June 1876 |
| RR/8/31 | Referee's report by James Clerk Maxwell, on a paper 'Residual charge of the leyden jar.—II. Dielectric properties of various glasses' by John Hopkinson | 25 February 1877 |
| RR/8/33 | Referee's report by James Clerk Maxwell, on a paper 'Electrostatic capacity of glass' by John Hopkinson | 21 June 1877 |
| RR/8/36 | Second letter from John Hopkinson, regarding a paper 'Electrostatic capacity of glass' by John Hopkinson | 20 November 1877 |
| RR/12/338 | Letter from John Hopkinson, regarding a paper 'Alternate current dynamo-electric machines' by John Hopkinson and E Wilson | [1895] |
| RR/8/258 | Referee's report by John Hopkinson, on a paper 'On the dynamo-electric current, and on certain means to improve its steadiness' by Charles William Siemens | 1 April 1880 |
| RR/8/35 | Letter from John Hopkinson, regarding a paper 'Electrostatic capacity of glass' by John Hopkinson | 12 November 1877 |
| RR/8/34 | Referee's report by George Carey Foster, on a paper 'Electrostatic capacity of glass' by John Hopkinson | 30 July 1877 |
| RR/8/324 | Referee's report by George Carey Foster, on a paper 'Electrostatic capacity of glass, II., and of liquids' by John Hopkinson | 5 February 1881 |
| RR/9/363 | Referee's report by William Grylls Adams, on a paper 'Dynamo-electric machinery' by John Hopkinson | 1 June 1886 |
| RR/9/284 | Referee's report by William Thomson, Lord Kelvin, on a paper 'Magnetisation of iron' by John Hopkinson | 8 October 1885 |
| RR/9/318 | Referee's report by John Hopkinson, on a paper 'The influence of stress and strain on the physical properties of matter' by Herbert Tomlinson | 4 March 1885 |
| RR/13/47 | Referee's report by Joseph John Thomson, on a paper 'On the capacity and residual charge dielectrics as affected by temperature and time' by John Hopkinson and E Wilson | 4 January 1897 |
| RR/12/111 | Referee's report by John Hopkinson, on a paper 'On the measurement of the magnetic properties of iron' by Thomas Gray | 15 May 1894 |
| RR/11/23 | Referee's report by John Hopkinson, on a paper 'On the time-relations of the excursions of the capillary electrometer, with a description of the method of using it for the investigation of electrical changes of short duration' by George James Burch | 7 October 1891 |
| RR/12/413 | Referee's report by John Hopkinson, on a paper 'Iron and steel at welding temperatures' by T Wrightson | 11 March 1895 |
| RR/12/335 | Referee's report by William Grylls Adams, on a paper 'Alternate current dynamo-electric machines' by John Hopkinson and E Wilson | 8 May 1895 |
| RR/12/336 | Letter from William Edward Ayrton, to John William Strutt, Lord Rayleigh, regarding a paper 'Alternate current dynamo-electric machines' by John Hopkinson and E Wilson | 22 July 1895 |
| RR/14/89 | Referee's report by John Hopkinson, on a paper 'Contributions to the theory of alternating currents' by W G Rhodes | 18 February 1898 |
| RR/12/337 | Referee's report by William Edward Ayrton, on a paper 'Alternate current dynamo-electric machines' by John Hopkinson and E Wilson | 29 July 1895 |
| RR/8/229 | Referee's report by William Thomson, Lord Kelvin, on a paper 'Electrostatic capacity of glass, II., and of liquids' by John Hopkinson | 11 January 1881 |
| RR/8/32 | Referee's report by George Carey Foster, on a paper 'Residual charge of the leyden jar.—II. Dielectric properties of various glasses' by John Hopkinson | 24 April 1877 |
| RR/9/349 | Referee's report by John Hopkinson, on a paper 'Effects of stress and magnetisation on the thermoelectric quality of iron' by James Alfred Ewing | 19 March 1886 |
| RR/10/119 | Referee's report by John Hopkinson, on a paper 'On the changes produced by magnetisation in the dimensions of rings and rods of iron and of some other metals' by Shelford Bidwell | 29 February 1888 |
| RR/10/275 | Referee's report by William Edward Ayrton, on a paper 'Magnetic and other physical properties of iron at a high temperature' by John Hopkinson | 16 May 1889 |
| RR/10/97 | Referee's report by John Hopkinson, on a paper 'The influence of stress and strain on the physical properties of matter.—Part I. Elasticity (continued).—The effect of magnetisation on the elasticity and the internal friction of metals' by Herbert Tomlinson | 15 April 1887 |
| MS/427/156 | Copy letter from [Michael] Foster, Secretary of the Royal Society; to Prof. [Henry Charles] Fleeming Jenkins and Dr. [John] Hopkinson | 21 January 1882 |
| MS/427/160 | Copy letter from [Michael] Foster, Secretary of the Royal Society; to Lieut-Col. [John] Donnelly. | 3 February 1882 |
| RR/9/47 | Referee's report by John Hopkinson, on a paper 'On the variation of the electrical resistance of glass with temperature, density, and chemical composition' by Thomas Gray | 2 February 1882 |
| PP/13/29/1 | Manuscript, 'Electrical resistance of iron at a high temperature' by J [John] Hopkinson | 1889 |
| NLB/2/512 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 25 July 1888 |
| NLB/3/620 | Copy letter from Herbert Rix, to Dr [John] Hopkinson, Fellow of the Royal Society | 25 July 1889 |
| NLB/3/1027 | Copy letter from Herbert Rix, to Dr John Hopkinson, [Fellow of the Royal Society] | 16 December 1889 |
| NLB/3/1063 | Copy letter from Herbert Rix, to [John William Strutt] the Lord Rayleigh, [Royal Society] | 3 January 1890 |
| NLB/8/562 | Copy letter from Herbert Rix, to Dr John Hopkinson, Fellow of the Royal Society | 15 November 1893 |
| RR/10/154 | Referee's report by John Hopkinson, on a paper 'On the magnetisation of iron and other magnetic metals in very strong fields' by James Alfred Ewing and William Low | 11 November 1888 |
| RR/12/138 | Referee's report by Joseph John Thomson, on a paper 'Propagation of magnetization of iron as affected by the electric currents in the iron' by John Hopkinson and E Wilson | 30 May 1894 |
| EC/1878/11 | Hopkinson, John: certificate of election to the Royal Society | |
| RR/9/350 | Letter from John Hopkinson, on a paper 'Effects of stress and magnetisation on the thermoelectric quality of iron' by James Alfred Ewing | 21 March 1886 |
| RR/10/152 | Referee's report by John Hopkinson, on a paper 'Magnetic qualities of nickel' by James Alfred Ewing and G C Cowan | 15 May 1888 |
| RR/12/334 | Referee's report by John Ambrose Fleming, on a paper 'Alternate current dynamo-electric machines' by John Hopkinson and E Wilson | 26 April 1895 |
| RR/10/274 | Referee's report by James Alfred Ewing, on a paper 'Magnetic and other physical properties of iron at a high temperature' by John Hopkinson | 26 April 1889 |
| RR/10/306 | Referee's report by John Hopkinson, on a paper 'On the magnetic action of displacement-currents in a dielectric' by Silvanus Phillips Thompson | 11 March 1889 |
| PP/9/17 | Paper, 'Notiz über die Dielectricitätsconstante von Flüssigkeiten' [Note on the dielectric constant of liquids] by [Georg Hermann] Quincke | 1 December 1886 |
| RR/8/98 | Referee's report by John Hopkinson, on a paper 'Double refraction and dispersion in Iceland Spar: an experimental investigation, with a comparison with Huyghen’s construction for the extraordinary wave' by Richard Tetley Glazebrook | 20 November 1879 |
| RR/9/92 | Referee's report by John Hopkinson, on a paper 'The influence of stress and strain on the action of physical forces' by Herbert Tomlinson | 29 March 1882 |
| RR/10/150 | Referee's report by John Hopkinson, on a paper 'Magnetic qualities of nickel (supplementary paper)' by James Alfred Ewing | 20 July 1888 |
| RR/12/139 | Referee's report by John Perry, on a paper 'Propagation of magnetization of iron as affected by the electric currents in the iron' by John Hopkinson and E Wilson | 18 June 1894 |
| AP/70/11 | Unpublished paper, 'The effect of mechanical stress and magnetisation on the physical properties of alloys of iron and nickel and of manganese steel' by Herbert Tomlinson | 1894 |
| RR/13/48 | Referee's report by John William Strutt, Lord Rayleigh, on a paper 'On the capacity and residual charge dielectrics as affected by temperature and time' by John Hopkinson and E Wilson | 1896 |
| RR/11/172 | Referee's report by John Hopkinson, on a paper 'On current curves' by R L Hippisley | 26 June 1892 |
| PP/10/20/1 | Manuscript, 'Note on the theory of the alternate current dynamo' by John Hopkinson | 1887 |
| PP/13/15/1 | Manuscript, 'Magnetisation of iron at high temperatures - preliminary notice' by John Hopkinson | 14 February 1889 |
| PP/9/16 | Paper, 'Note on specific inductive capacity' by John Hopkinson | 1886 |
| PP/10/19/1 | Manuscript, 'Note on induction coils or "transformers"' by John Hopkinson | 1887 |
| PP/10/19 | Paper, 'Note on induction coils or "transformers"' by John Hopkinson | 1887 |
| PP/10/20 | Paper, 'Note on the theory of the alternate current dynamo' by John Hopkinson | 1887 |
| PP/10/19/2 | Diagrams, geometrical diagrams by John Hopkinson | 1887 |
| PP/10/20/2 | Diagram, alternate current dynamo by John Hopkinson | 1887 |
| PP/11/6 | Paper, 'Specific inductive capacity [dielectric constant]' by J [John] Hopkinson | 1887 |
| PP/11/6/1 | Manuscript, 'Specific inductive capacity [dielectric constant]' by J [John] Hopkinson | 1887 |
| PP/11/6/2 | Diagrams, circuit diagrams by J [John] Hopkinson | 1887 |
| PP/13/29 | Paper, 'Electrical resistance of iron at a high temperature' by J [John] Hopkinson | 1889 |
| PP/12/24 | Paper, 'Magnetic properties of an impure nickel' by J [John] Hopkinson | 1888 |
| PP/12/24/1 | Manuscript, 'Magnetic properties of an impure nickel' by J [John] Hopkinson | 1888 |
| PP/12/24/2 | Diagrams, experimental results by J [John] Hopkinson | 1888 |
| PP/13/15 | Paper, 'Magnetisation of iron at high temperatures - preliminary notice' by John Hopkinson | 14 February 1889 |
| PP/13/15/2 | Diagrams, experimental results by John Hopkinson | 14 February 1889 |
| PP/13/29/2 | Diagram, experimental results by J [John] Hopkinson | 1889 |
| PP/20/19 | Paper, 'Magnetic properties of pure iron' by Francis Lydall and Alfred W S Pocklington | 1892 |
| PP/15/4/1 | Manuscript, 'Magnetic properties of alloys of nickel and iron' by J [John] Hopkinson | 1889 |
| PP/15/4/2 | Diagrams, experimental results by J [John] Hopkinson | 1889 |
| PP/15/11 | Paper, 'Physical properties of nickel steel' by J [John] Hopkinson | 1890 |
| PP/16/1 | Paper, 'Magnetic properties of alloys of Nickel and iron' by John Hopkinson | 1890 |
| PP/16/1/1 | Manuscript, 'Magnetic properties of alloys of Nickel and iron' by John Hopkinson | 1890 |
| PP/16/1/2 | Diagrams, experimental results by John Hopkinson | 1890 |
| PP/15/4 | Paper, 'Magnetic properties of alloys of nickel and iron' by J [John] Hopkinson | 1889 |
| PP/16/33/2 | Diagrams, experimental equipment and results by John Hopkinson | 1890 |
| PP/21/8 | Paper, 'Magnetic viscosity' by John Hopkinson, E Wilson and Francis Lydall | 1893 |
| PP/19/3 | Paper, 'Dynamo-electric machinery' by John Hopkinson and E Wilson | 1892 |
| PP/19/3/1 | Manuscript, 'Dynamo-electric machinery' by John Hopkinson and E Wilson | 1892 |
| PP/19/3/2 | Diagrams, experimental observations by John Hopkinson and E Wilson | 1892 |
| PP/21/8/1 | Manuscript, 'Magnetic viscosity' by John Hopkinson, E Wilson and Francis Lydall | 1893 |
| PP/21/8/2 | Diagrams, experimental equipment and results by John Hopkinson, E Wilson and Francis Lydall | 1893 |
| PP/16/33/1 | Manuscript, 'Magnetism and recalescence' by John Hopkinson | 1890 |
| PP/22/26 | Diagrams, experimental equipment and results by John Hopkinson, E Wilson and Francis Lydall | 1893 |
| PP/16/33 | Paper, 'Magnetism and recalescence' by John Hopkinson | 1890 |
| RR/8/96 | Referee's report by John Hopkinson, on a paper 'An experimental determination of the values of the velocities of normal propagation of plane waves in different directions in a biaxal crystal, and a comparison of the results with theory' by Richard Tetley Glazebrook | 22 July 1878 |
| RR/9/300 | Referee's report by John Hopkinson, on a paper 'On the connexion between electric current and the electric and magnetic inductions in the surrounding field' by John Henry Poynting | 19 May 1885 |
| RR/10/251 | Referee's report by John Hopkinson, on a paper 'On the effect of temperature on the specific inductive capacity of a dielectric' by W Cassie | 13 July 1889 |
| RR/10/276 | Referee's report by Arthur William Rucker, on a paper 'Magnetic and other physical properties of iron at a high temperature' by John Hopkinson | 19 June 1889 |
| RR/10/312 | Referee's report by John Hopkinson, on a paper 'The influence of stress and strain on the physical properties of matter.— Part III. Magnetic induction (continued).—The internal friction of nickel, and cobalt, studied by means of magnetic cycles of very minute range' by Herbert Tomlinson | [1889] |
| MC/15/112 | Letter from [John] Hopkinson, Holmwood, Wimbledon Common, to the Royal Society | 22 November 1890 |
| MC/15 | Volume 15 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1889-1892 |
| MC/17 | Volume 17 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1897-1899 |