| RefNo | Title | Date |
| EC/1881/08 | Ayrton, William Edward: certificate of election to the Royal Society | |
| NLB/20/47 | Copy letter from Robert William Frederick Harrison, to Professor George Carey Foster, Fellow of the Royal Society | 20 January 1900 |
| NLB/23/2/301 | Copy letter sent from Joseph Larmor, to Professor William Edward Ayrton, Fellow of the Royal Society | 11 February 1903 |
| NLB/7/566 | Copy letter from Herbert Rix, to Professor William Edward Ayrton | 15 March 1893 |
| NLB/4/1194 | Copy letter from Herbert Rix, to Professor William Edward Ayrton | 10 February 1891 |
| NLB/2/77 | Copy letter from Herbert Rix, to John William Strutt, 3rd Baron Rayleigh | 6 January 1888 |
| NLB/4/837 | Copy letter from Michael Foster, to the Clerk, Christ's Hospital, E.C. | 7 November 1890 |
| NLB/4/241 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 22 March 1890 |
| NLB/4/632 | Copy letter from Herbert Rix, to Sir Henry Enfield Roscoe, Professor William Edward Ayrton, Charles Baron Clarke, William Henry Mahoney Christie, Dr Hugo Muller, Dr Armstrong, and Professor Joseph John Thomson. | 25 July 1890 |
| NLB/4/763 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 17 October 1890 |
| NLB/4/755 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 17 October 1890 |
| NLB/3/352 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 17 May 1889 |
| NLB/4/1139 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society, Hornbury Crescent, W. | 28 January 1891 |
| NLB/3/513 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 1 July 1889 |
| NLB/4/1084 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 16 January 1891 |
| NLB/4/1117 | Copy letter from Herbert Rix, to Professor William Edward Ayrton | 21 January 1891 |
| NLB/6/601 | Copy letter from Herbert Rix, to Lord Rayleigh [John William Strutt] | 9 June 1892 |
| NLB/3/775 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 7 October 1889 |
| NLB/5/958 | Copy letter from an unknown correspondent, to Messrs West, Newman & Company | 24 November 1891 |
| NLB/6/667 | Copy letter from Herbert Rix, to Professor William Edward Ayrton | 23 June 1892 |
| NLB/6/714 | Copy letter from Herbert Rix, to Professor William Edward Ayrton | 1 July 1892 |
| NLB/5/15 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society, 7 Horbury Crescent, Notting Hill, W. | 18 February 1891 |
| NLB/5/197 | Copy letter from Herbert Rix, to Messrs Harrison & Sons, St Martins Lane | 11 April 1891 |
| NLB/6/1112 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 25 October 1892 |
| NLB/5/134 | Copy letter from Herbert Rix, to [John William Strutt] Lord Rayleigh, [Royal Society] | 2 April 1891 |
| NLB/5/424 | Copy letter from Herbert Rix, to Dr Hopkinson | 6 June 1891 |
| NLB/5/199 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 11 April 1891 |
| NLB/5/769 | Copy letter from Herbert Rix, to [John William Strutt] Lord Rayleigh, [Royal Society] | 7 October 1891 |
| NLB/6/912 | Copy letter from Theodore E James, to Lord Rayleigh [John William Strutt] | 10 September 1892 |
| NLB/5/386 | Copy letter from Michael Foster, to Sir Frederick Abel, Secretary, Imperial Institute | 2 June 1891 |
| NLB/5/373 | Copy letter from Herbert Rix, to [John William Strutt] Lord Rayleigh, [Royal Society] | 30 May 1891 |
| NLB/7/615 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 23 March 1893 |
| NLB/7/281 | Copy letter from Herbert Rix, to Lord Kelvin [William Thomson], Fellow of the Royal Society | 11 January 1893 |
| NLB/5/606 | Copy letter from Herbert Rix, to Professor Michael Foster, [Royal Society] | 22 July 1891 |
| NLB/5/604 | Copy letter from Herbert Rix, to James Thomson Bottomley, Fellow of the Royal Society | 22 July 1891 |
| NLB/7/524 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 7 March 1893 |
| NLB/5/744 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, [Fellow of the Royal Society] | 3 October 1891 |
| NLB/5/773 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, [Fellow of the Royal Society] | 8 October 1891 |
| NLB/5/925 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 17 November 1891 |
| NLB/5/961 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 23 November 1891 |
| NLB/5/949 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 23 November 1891 |
| NLB/5/1023 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 10 December 1891 |
| NLB/7/635 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 27 March 1893 |
| NLB/5/1082 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 1 January 1892 |
| NLB/15/41 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 11 June 1897 |
| NLB/12/504 | Copy letter from Herbert Rix, to Mr Collings | 2 March 1896 |
| NLB/9/138 | Copy letter from Herbert Rix, to R L Franks, Clerk of Christ's Hospital, E.C. | 5 April 1894 |
| NLB/22/425 | Copy letter from Robert William Frederick Harrison, to Professor [William Edward] Ayrton, Fellow of the Royal Society | 14 May 1901 |
| NLB/9/278 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 24 April 1894 |
| NLB/11/122 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society, 41 Kensington Park Gardens, W. | 25 April 1895 |
| NLB/12/541 | Copy letter from an unknown correspondent, to Mr Collings | 11 March 1896 |
| NLB/9/508 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 29 May 1894 |
| NLB/13/42 | Copy letter from Robert William Frederick Harrison, to Richard Tetley Glazebrook, Fellow of the Royal Society | 1 June 1896 |
| NLB/12/166 | Copy letter from Herbert Rix, to Lord Rayleigh [John William Strutt], Secretary, Royal Society | 23 December 1895 |
| NLB/13/826 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 4 December 1896 |
| NLB/12/53 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 29 November 1895 |
| NLB/14/790 | Copy letter from Robert William Frederick Harrison, to J Hookey, Telegraph Department, Post Office | 17 May 1897 |
| NLB/14/874 | Copy letter from Arthur William Rucker, to William Edward Ayrton, [Fellow of the Royal Society] | 31 May 1897 |
| NLB/14/781 | Copy letter from Robert William Frederick Harrison, to William Henry Preece, Fellow of the Royal Society | 14 May 1897 |
| NLB/15/405 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 23 September 1897 |
| NLB/22/652 | Copy letter from Robert William Frederick Harrison, to [William Edward] Ayrton, [Fellow of the Royal Society] | 20 June 1901 |
| RR/17/118 | Referee's report by John William Strutt, 3rd Baron Rayleigh, on a paper 'A new current weigher and a determination of the electromotive force of the normal Weston cadmium cell' by William Edward Ayrton, Thomas Mather and Frank Edward Smith | [June 1907] |
| RR/17/119 | Referee's report by Andrew Gray, on a paper 'A new current weigher and a determination of the electromotive force of the normal Weston cadmium cell' by William Edward Ayrton, Thomas Mather and Frank Edward Smith | 18 July 1907 |
| NLB/17/21 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 4 July 1898 |
| NLB/15/231 | Copy letter from Robert William Frederick Harrison, to T E Davies, Royal College of Science, South Kensington, S.W. | 20 July 1897 |
| NLB/16/103 | Copy letter from Arthur William Rucker, to [R T] Glazebrook | 31 January 1898 |
| NLB/17/297 | Copy letter from Arthur William Rucker, to William Edward Ayrton, [Fellow of the Royal Society] | 5 October 1898 |
| NLB/17/748 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, [Fellow of the Royal Society] | 15 December 1898 |
| NLB/17/424 | Copy letter from Robert William Frederick Harrison, to Shelford Bidwell, President of the Physical Society, Professor William Edward Ayrton and James Swinburne, Fellows of the Royal Society | 27 October 1898 |
| NLB/17/444 | Copy letter from Robert William Frederick Harrison, to Messrs Drake & Gorham, 66 Victoria Street, S.W. | 2 November 1898 |
| NLB/19/130 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 27 June 1899 |
| NLB/18/398 | Copy letter from Arthur William Rucker, to [Professor W E] Ayrton | 3 March 1899 |
| NLB/18/437 | Copy letter from Robert William Frederick Harrison, to Professor [W E] Ayrton, Fellow of the Royal Society | 9 March 1899 |
| NLB/19/379 | Copy letter from Michael Foster, to William Edward Ayrton, [Fellow of the Royal Society] | 7 September 1899 |
| NLB/18/149 | Copy letter from Arthur William Rucker, to Professor [A R] Forsyth, [Fellow of the Royal Society] | 24 January 1899 |
| NLB/19/221 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 14 July 1899 |
| NLB/19/472 | Copy letter from Robert William Frederick Harrison, to Professor Arthur William Rucker, Secretary, Royal Society, Hotel zur Rose, Wiesbaden, Germany | 10 October 1899 |
| NLB/19/849 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 8 January 1900 |
| NLB/22/571 | Copy letter from Robert William Frederick Harrison, to Professor [William Edward] Ayrton, Fellow of the Royal Society | 7 June 1901 |
| NLB/18/559 | Copy letter from Robert William Frederick Harrison, to Professor Arthur William Rucker, Secretary of the Royal Society | 29 March 1899 |
| NLB/20/774 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, [Fellow of the Royal Society] | 4 July 1900 |
| NLB/20/785 | Copy letter from Robert William Frederick Harrison, to Professor John Perry, Fellow of the Royal Society | 10 July 1900 |
| NLB/20/775 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 6 July 1900 |
| NLB/20/798 | Copy letter and contract from Robert William Frederick Harrison, to Professor William Edward Ayrton, [Fellow of the Royal Society] | 11 July 1900 |
| NLB/21/156 | Copy letter from Theodore E James, to Professor William Edward Ayrton, Fellow of the Royal Society | 31 August 1900 |
| NLB/22/713 | Copy letter from Robert William Frederick Harrison, to Professor [William Edward] Ayrton, [Fellow of the Royal Society] | 2 July 1901 |
| NLB/23/2/135 | Copy letter from unknown correspondent, to General The Right Honorable Sir Dighton Probyn | 8 November 1901 |
| NLB/23/2/137 | Copy letter from Sir Michael Foster, to Professor William Edward Ayrton, Fellow of the Royal Society | 14 November 1901 |
| NLB/23/1/876 | Copy letter from Alfred Bray Kempe, to Professor William Edward Ayrton, Fellow of the Royal Society | [7 February 1902] |
| NLB/31/241 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 13 July 1905 |
| NLB/27/305 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 4 August 1903 |
| NLB/27/507 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 9 October 1903 |
| NLB/30/559 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 12 April 1905 |
| NLB/30/378 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 15 March 1905 |
| NLB/30/489 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 31 March 1905 |
| NLB/30/824 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 29 May 1905 |
| NLB/28/688 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 2 May 1904 |
| NLB/31/866 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 27 November 1905 |
| NLB/35/174 | Copy letter from Robert William Frederick Harrison, to Lord Rayleigh [John William Strutt], President, Royal Society | 29 April 1907 |
| NLB/37/130 | Copy letter from Robert William Frederick Harrison to Professor W [William] E [Edward] Ayrton FRS | 29 January 1908 |
| NLB/37/786 | Copy letter from Robert William Frederick Harrison to Professor W [William] E [Edward] Ayrton, Fellow of the Royal Society | 15 May 1908 |
| NLB/39/154 | Copy letter from Robert William Frederick Harrison to Professor J [John] Perry, Fellow of the Royal Society | 3 December 1908 |
| NLB/37/464 | Copy letter from Robert William Frederick Harrison to Professor W [William] E [Edward] Ayrton, Fellow of the Royal Society | 23 March 1908 |
| NLB/37/882 | Copy Letter from Joseph Larmor to Professor W [William Mitchinson] Hicks | 29 May 1908 |
| NLB/39/223 | Copy letter from Robert William Frederick Harrison to Harrison & Sons | 14 December 1908 |
| RR/11/102 | Referee's report by William Edward Ayrton, on an unnamed paper by Henry Wilde | 29 May 1891 |
| RR/9/77 | Referee's report by William Edward Ayrton, on a paper 'On seismic experiments' by John Milne and T Gray | 23 February 1882 |
| RR/8/147 | Referee's report by William Thomson, Lord Kelvin, on a paper 'The contact theory of voltaic action.—Paper No. III' by William Edward Ayrton and John Perry | 29 October 1878 |
| RR/11/119 | Referee's report by William Edward Ayrton, on a paper 'Thermal radiation in absolute measure' by James Thomson Bottomley | 22 August 1892 |
| RR/11/7 | Referee's report by William Grylls Adams, on a paper 'The thermal emissivity of thin wires in air' by William Edward Ayrton and H Kilgour | 6 October 1891 |
| RR/10/391 | Letter from William Edward Ayrton, to Herbert Rix, regarding a paper 'On the asymmetrical distribution of terrestrial magentism' by Henry Wilde | 27 January 1890 |
| RR/11/179 | Referee's report by William Edward Ayrton, on a paper 'On the thermal conductivities of crystals and other bad conductors' by Charles Herbert Lees | 17 March 1892 |
| RR/13/28 | Referee's report by William Edward Ayrton, on a paper 'On some recent investigations in connection with the electro-deposition of metals' by F C Graham | 8 December 1896 |
| RR/13/15 | Referee's report by William Edward Ayrton, on a paper 'On professor Hermann’s theory of the capillary electrometer' by George James Burch | 7 November 1896 |
| RR/12/38 | Referee's report by William Edward Ayrton, on a paper 'The absolute thermal conductivities of iron and copper' by Wallace R Stewart | 4 May 1893 |
| MS/427/15 | Copy letter from [George Gabriel] Stokes, Secretary of the Royal Society; to [William Edward] Ayrton | 29 November 1879 |
| 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/13/4 | Memorandum from Wiliam Edward Ayrton, on his paper with W R Cooper 'Variations in the electromotive force of clark cells with temperature' to the Secretary of the Royal Society | 29 January 1896 |
| 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/14/275 | Referee's report by William Edward Ayrton, on a paper 'On a rotary converter' by E Wilson | 28 March 1899 |
| RR/14/15 | Referee's report by Willian Edward Ayrton, on a paper 'The magnetic flumes in meters and other electrical instruments' by A Campbell | 26 July 1898 |
| RR/13/235 | Referee's report by William Edward Ayrton, on a paper 'On contact electricity of metals' by J Erskine Murray | 9 October 1897 |
| RR/14/88 | Referee's report by William Edward Ayrton, on a paper 'Contributions to the theory of alternating currents' by W G Rhodes | 29 January 1898 |
| RR/14/117 | Letter from William Edward Ayrton, to R W F Harrison, regarding a paper 'Thermal radiation in absolute measure' by James Thomson Bottomley and J C Beattie | 12 February 1900 |
| RR/10/294 | Referee's report by William Edward Ayrton, on a paper 'Experiments on the resistance of electrolytic cells' by Matthew Henry Phineas Riall Sankey | 24 October 1889 |
| RR/14/115 | Referee's report by William Edward Ayrton, on a paper 'Thermal radiation in absolute measure' by James Thomson Bottomley and J C Beattie | 20 January 1900 |
| RR/11/6 | Referee's report by George Carey Foster, on a paper 'The thermal emissivity of thin wires in air' by William Edward Ayrton and H Kilgour | 11 August 1891 |
| RR/13/6 | Referee's report by William Edward Ayrton, on a paper 'The hysteresis of iron and steel in a rotating magnetic field' by Francis Gibson Baily | 18 June 1896 |
| 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/10/333 | Referee's report by William Edward Ayrton, on a paper 'The rupture of steel by longitudinal stress' by Charles A Carus-Wilson | 15 October 1890 |
| MS/427/350 | Copy letter from Walter White, Assistant Secretary of the Royal Society; to Prof. [William Edward] Ayrton, FRS | 14 March 1884 |
| MS/427/27 | Copy letter from Walter White, Assistant Secretary of the Royal Society; to [Cromwell Fleetwood] Varley Esq. | 21 January 1880 |
| MC/21/14 | Letter from William Edward Ayrton, Chlemsford, to [Robert William Frederick] Harrison | 3 June 1906 |
| NLB/5/565 | Copy letter from Herbert Rix, to Professor William Edward Ayrton, Fellow of the Royal Society | 13 July 1891 |
| NLB/5/651 | Copy letter from A H White, to Professor William Edward Ayrton, Fellow of the Royal Society | 6 August 1891 |
| NLB/13/1 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 27 May 1896 |
| NLB/13/127 | Copy letter from Robert William Frederick Harrison, to Richard Tetley Glazebrook, Fellow of the Royal Society | 19 June 1896 |
| RR/11/5 | Referee's report by James Thomson Bottomley, on a paper 'Quadrant electrometers' by William Edward Ayrton, John Perry and W E Sumpner | 3 July 1891 |
| NLB/3/949 | Copy letter from Herbert Rix, to Professor Michael Foster, [Royal Society] | 22 November 1889 |
| NLB/5/8 | Copy letter from Herbert Rix, to Professor Arthur William Rücker, Fellow of the Royal Society | 16 February 1891 |
| NLB/9/164 | Copy letter from Herbert Rix, to Professor Thomas Edward Thorpe, Fellow of the Royal Society | 9 April 1894 |
| NLB/12/897 | Copy letter from Robert William Frederick Harrison, to Richard Tetley Glazebrook, Fellow of the Royal Society | 23 May 1896 |
| NLB/19/455 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 7 October 1899 |
| NLB/36/883 | Copy letter from Robert William Frederick Harrison, to James Swinburne, Fellow of the Royal Society | 7 January 1908 |
| NLB/5 | New Letter Book volume 5, copy letters sent from Royal Society administration | 13 February 1891-5 February 1892 |
| RR/12/252 | Referee's report by William Edward Ayrton, on a paper 'The effect of mechanical stress and of magnetisation on the physical properties of alloys of iron and nickel and of manganese steel' by Herbert Tomlinson | 11 July 1894 |
| RR/11/81 | Referee's report by William Edward Ayrton, on two papers 'A study of the Planté lead-sulphuric acid-lead peroxide cell, from a chemical stand-point. Part I' and 'A study of the Planté lead-sulphuric acid-lead peroxide cell, from a chemical stand-point. Part II.—A discussion of the chemical changes occurring in the cell' by G H Robertson and H E Armstrong | 19 August 1891 |
| AP/72/2 | Unpublished appendix, 'Measurement of high potential difference' by H C Leake, R Leventhorpe and C S Whitehead | 1895 |
| PP/17/31/1 | Manuscript, 'The measurement of the power given by any electric current to any circuit' by William Edward Ayrton and W E [William Edward] Sumpner | 1891 |
| PP/17/31 | Paper, 'The measurement of the power given by any electric current to any circuit' by William Edward Ayrton and W E [William Edward] Sumpner | 1891 |
| PP/17/31/2 | Diagrams, experimental equipment and results by William Edward Ayrton and W E [William Edward] Sumpner | 1891 |
| PP/4/27 | Paper, 'A new form of spring for electric and other measuring instruments' by W E [William Edward] Ayrton and John Perry | 1884 |
| RR/8/346 | Referee's report by William Edward Ayrton, on a paper 'Experiments to determine the value of the British Association unit of resistance in absolute measure' by John William Strutt, 3rd Baron Rayleigh | 15 April 1881 |
| RR/10/393 | Second letter from William Edward Ayrton, to Herbert Rix, regarding a paper 'On the asymmetrical distribution of terrestrial magentism' by Henry Wilde | 13 February 1891 |
| RR/13/3 | Letter from Wiliam Edward Ayrton, on his paper with W R Cooper 'Variations in the electromotive force of clark cells with temperature' to the Secretary of the Royal Society | 21 January 1895 |
| MC/16/101 | Letter from [William Edward] Ayrton, City & Guilds of London Institute for the Advancement of Technical Education, Central Institution, Exhibition Road, London, to the Secretaries of the Royal Society | 12 March 1894 |
| MC/16 | Volume 16 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1893-1896 |
| MC/23/114 | Letter from William Crookes, 7 Kensington Gardens, London, to Mr [Robert] Harrison, [The Royal Society] | 10 November 1908 |
| MS/603/1/39 | Letter from W E [William Edward] Ayrton, 41 Norfolk Square, Hyde Park, to [Joseph] Larmor | 30 January 1908 |
| MC/21/16 | Postcard from [William Edward] Ayrton, 41 Norfolk Square, Hyde Park, to [Robert William Frederick] Harrison, Assistant Secretary of the Royal Society, Burlington House | 23 March 1906 |
| NLB/32/530 | Copy letter from Robert William Frederick Harrison, to Professor William Edward Ayrton, Fellow of the Royal Society | 28 March 1906 |
| MC/21/17 | Letter from William Edward Ayrton, Chlemsford, to [Robert William Frederick] Harrison, Assistant secretary of the Royal Society | 29 November 1906 |
| MC/21 | Volume 21 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1906 |
| MC/23/24 | Letter from [William Edward] Ayrton, Exhibition Road, London, to [Robert] Harrison, Assistant Secretary and Librarian, Royal Society | 6-21 March 1908 |
| MC/23 | Volume 23 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1908 |
| MS/603/1/38 | Letter from W E [William Edward] Ayrton, 41 Norfolk Square, Hyde Park, to Dr. [Joseph] Larmor, St. John's College | 25 July 1907 |