| RefNo | Title | Date |
| EC/1828/17 | Ritchie, William: certificate of election to the Royal Society | |
| RR/1/207 | Referee's report by Samuel Hunter Christie, on a paper 'On the method employed for exploding a mixture of oxygen and hydrogen gases, by a spark obtained from a common magnet' by William Ritchie | 10 June 1832 |
| RR/1/205 | Referee's report by Charles Wheatstone, on a paper 'An attempt to account for the discrepancy between the actual velocity of sound in air or vapour, and that resulting from theory' by William Ritchie | |
| NLB/10/737 | Copy letter from Herbert Rix, to George Stronach, Advocate's Library, Edinburgh | 29 January 1895 |
| MC/2/21 | Letter from William Ritchie, Royal Institution, to Dr. [Peter Mark] Roget, Secretary of the Royal Society | 9 February 1832 |
| PT/20/7/6 | Plate, voltaic power of batteries by William Ritchie | [1832] |
| PT/20/7/7 | Plate, arrangement of charcoal, copper slips, and astatic needle by William Ritchie | [1832] |
| PT/20/7/5 | Plate, copper plates arranged for electromagnetic experiment by William Ritchie | [1832] |
| PT/20/7/8 | Plate, glass tube in two wooden boxes by William Ritchie | [1832] |
| PT/20/7/11 | Plate, rectangular box with compartments by William Ritchie | [1832] |
| PT/20/7/9 | Plate, arrangement of cylinder, mercury, wire, and magnet by William Ritchie | [1832] |
| PT/20/7/1 | Manuscript, 'Experimental researches in voltaic electricity and electro-magnetism' by Rev William Ritchie | [1832] |
| PT/20/7/2 | Plate, oxygen and hydrogen between zinc and copper plates by William Ritchie | [1832] |
| PT/20/7/3 | Plate, glass tube with diluted acid by William Ritchie | [1832] |
| PT/20/7/10 | Plate, glass cylinders cemented in wood by William Ritchie | [1832] |
| PT/20/7/4 | Plate, zinc and copper plates in trough with diluted acid by William Ritchie | [1832] |
| MC/2 | Volume 2 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1832-1838 |
| MC/2/18 | Letter from Reverend D. [?] Ritchie, to the Royal Society | 4 February 1832 |
| AP/15/26/1 | Unpublished manuscript, 'On the method employed for exploding a mixture of oxygen and hydrogen gases by a spark obtained from a common magnet' by William Ritchie | [1832] |
| RR/1/206 | Referee's report by Samuel Hunter Christie and William Hasledine Pepys, on a paper 'On the law which connects the various magneto-electric phenomena, lastly discovered by Dr Faraday' by William Ritchie | 31 January 1838 |
| AP/15/26/2 | Unpublished diagram, apparatus for exploding gases by William Ritchie | [1832] |
| AP/15/9 | Unpublished paper, 'An experimental investigation of the phenomena of endosmose and exosmose' by William Ritchie | [1831] |
| AP/15/26 | Unpublished paper, 'On the method employed for exploding a mixture of oxygen and hydrogen gases by a spark obtained from a common magnet' by William Ritchie | [1832] |
| AP/15/25 | Unpublished paper, 'On the law which connects the various magneto-electric phenomena lately discovered by Dr [Michael] Faraday' by William Ritchie | [1832] |
| AP/21/8 | Unpublished paper, 'An attempt to account for the discrepancy between the actual velocity of sound in air or vapour and that resulting from theory' by William Ritchie | November 1836 |
| AP/21/9 | Unpublished paper, 'Experimental researches on the conducting power of wires for electricity and on the heat developed in metallic and liquid conductors' by William Ritchie | [May 1837] |
| PT/20/7 | Paper, 'Experimental researches in voltaic electricity and electro-magnetism' by Rev William Ritchie | [1832] |
| RR/1/208 | Referee's report by John Botstock, on a paper 'Experimental researches in electro-magnetism and magneto-electricity' by William Ritchie | 2 February 1832 |
| HS/14/349 | Letter, from William Ritchie to Sir John Herschel, dated at Tain | 3 March 1825 |
| HS/14/361 | Letter, from William Ritchie to Sir John Herschel, dated at Royal Institution | 13 October 1831 |
| HS/14/360 | Letter, from William Ritchie to Sir John Herschel, dated at Royal Institution | 13 September 1831 |
| HS/14/355 | Letter, from William Ritchie to Sir John Herschel, dated at Edinburgh | 11 January 1828 |
| HS/14/359 | Letter, from William Ritchie to Sir John Herschel, dated at Tain | 6 April 1829 |
| HS/14/353 | Letter, from William Ritchie to Sir John Herschel, dated at Edinburgh | 28 July 1827 |
| HS/14/347 | Draft letter, from Sir John Herschel to William Ritchie, dated at London | 27 January 1825 |
| HS/14/362 | Letter, from William Ritchie to Sir John Herschel, dated at University of London | 8 November 1832 |
| HS/14/352 | Letter, from William Ritchie to Sir John Herschel, dated at Paris | 27 February 1827 |
| HS/14/348 | Letter, from William Ritchie to Sir John Herschel, dated at Tain | 30 January 1825 |
| HS/14/357 | Letter, from William Ritchie to Sir John Herschel, dated at Tain | 10 May 1828 |
| HS/14/350 | Incomplete letter, from William Ritchie to Sir John Herschel, dated at Tain | 14 December 1826 |
| HS/14/354 | Letter, from William Ritchie to Sir John Herschel, dated at Tain | 6 December 1827 |
| HS/14/358 | Letter, from William Ritchie to Sir John Herschel, dated at Tain | 14 June 1828 |
| HS/14/351 | Letter, from William Ritchie to Sir John Herschel, dated at Paris | 9 January 1827 |
| HS/14/356 | Letter, from William Ritchie to Sir John Herschel, dated at Tain | 3 May 1828 |
| HS/14/363 | Copy letter, from Sir John Herschel to William Ritchie, dated at Slough | 9 November 1832 |
| HS/20/200 | Copy letter, from Sir John Herschel to William Ritchie | 19 February 1825 |