| Reference number | Title | Date |
| IM/002714 | Lennox-Conyngham, Sir Gerald Ponsonby | nd |
| RR/16/335 | Referee's report by William Davidson Niven, on a paper 'An account of the pendulum observations made at Kew & Greenwich Observatories in 1903' by Gerald Ponsonby Lenox-Conyngham | July 1905 |
| RR/16/336 | Referee's report by Frank Watson Dyson, on a paper, 'An account of the pendulum observations made at Kew & Greenwich observatories in 1903' by Gerald Ponsonby Lenox-Conyngham | 28 July 1905 |
| NLB/36/767 | Copy letter from Joseph Larmor, to Charles Chree, [Fellow of the Royal Society] | 12 December 1907 |
| NLB/62/504 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Sir [Gerald Ponsonby] Lenox-Conyngham, FRS | 23 February 1922 |
| NLB/63/96 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir [Gerald Ponsonby] Lenox-Conyngham, FRS | 27 June 1922 |
| NLB/60/220 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald [Ponsonby] Lenox-Conyngham, FRS | 30 December 1920 |
| NLB/60/128 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Sir [Gerard Ponsonby] Lenox-Conyngham, FRS | 11 December 1920 |
| NLB/59/480 | Copy letter from Edwin Deller, Assistant Secretary of the Royal Society; to Colonel Sir Gerald Lenox Conyngham, FRS | 6 October 1920 |
| NLB/63/132 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society and FRS; to Sir Gerald [Ponsonby] Lenox-Conyngham, FRS, 41 Gay Street, Bath | 04 July 1922 |
| NLB/60/159 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald [Ponsonby] Lenox-Conyngham, FRS | 16 December 1920 |
| RR/47/130 | Referee's report by Gerald Ponsonby Lenox-Conyngham, on a paper 'Further history of a quartz thread gravity balance' by Richard Threlfall and Alfred John Dawson | February 1932 |
| NLB/57/237 | Copy letter from Robert William Frederick Harrison, Assistant Secretary of the Royal Society; to Colonol GP [Gerald Ponsonby] Lenox-Conyngham, FRS | 25 September 1919 |
| NLB/61/837 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Sir [Gerald Ponsonby] Lenox Conyngham, FRS | 3 November 1921 |
| RR/54/1 | Referee's report by Gerald Ponsonby Lenox-Conyngham, on a paper 'Travel times in seismology' by Harold Jeffreys | 10 July 1935 |
| NLB/67/392 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 13 December 1924 |
| RR/65/58 | Referee's report by Gerald Ponsonby Lenox-Conyngham, on a paper 'An absolute determination of the acceleration due to gravity' by J S Clark | 29 July 1938 |
| NLB/63/143 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society and FRS; to Commander F. Branco, P.N., Portuguese Naval Attache, 12 Gloucester Place, Portman Square, W.1. | 06 July 1922 |
| NLB/64/171 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to the Under Secretary of State; Colonial Office, S.W.l. | 16 February 1923 |
| NLB/64/19 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Sir [Gerald Ponsonby] Lenox-Conyngham, FRS | 19 January 1923 |
| NLB/64/457 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Sir David Orme Masson, FRS; Australian National Research Council, Royal Society's House, 5 Elizabeth Street, Sydney | 18 April 1923 |
| NLB/63/51 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir [Gerald Ponsonby] Lenox-Conyngham, FRS | 19 June 1922 |
| NLB/66/23 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lewnox-Conyngham, FRS., Cambridge | 8 February 1924 |
| NLB/66/215 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Dr. [John Edward] Marr, FRS | 18 March 1924 |
| NLB/66/22 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society to the H.M. Inspector of Taxes, Picadilly District, Grosvenor Gardens, S.W.1 | 8 February 1924 |
| NLB/66/123 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS. | 25 February 1924 |
| NLB/67/616 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 30 January 1925 |
| NLB/67/570 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Sir Gerald [Ponsonby] Lenox-Conyngham, FRS | 23 January 1925 |
| NLB/66/158 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 5 March 1924 |
| NLB/66/598 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to H. Eustance Davies, Esq., Treasury Chambers, Whitehall, S.W.1 | 3 June 1924 |
| NLB/66/747 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to the Secretary, Treasury, Whitehall, S.W.1 | 3 July 1924 |
| NLB/68/774 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 31 October 1925 |
| NLB/69/625 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 30 June 1926 |
| NLB/69/167 | Copy letter from Henry Hallett Dale, Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 22 January 1926 |
| NLB/66/883 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to Sir [Gerald Ponsonby] Lenox-Conyngham, FRS | 6 August 1924 |
| NLB/70/37 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Lady Lenox-Conyngham | 8 December 1926 |
| NLB/69/171 | Copy letter from Henry Hallett Dale, Secretary of the Royal Society; to Sir [Albert Charles] Seward, FRS | 22 January 1926 |
| NLB/69/825 | Copy letter from James Hopwood Jeans, Secretary of the Royal Society; to the Under-Secretary of State for India, India Office, Whitehall, SW1 | 28 October 1926 |
| NLB/70/517 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox Conyngham, FRS | 28 April 1927 |
| CD/5/44 | Copy letter from William Bate Hardy, Secretary of the Royal Society, to Sir Gerald Ponsonby Lenox-Conyngham | 5 April 1923 |
| CD/5/54 | Letter from Sir Gerald Ponsonby Lenox-Conyngham, to Francis Alexander Towle, Assistant Secretary of the Royal Society | 25 April 1923 |
| NLB/72/483 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 11 November 1929 |
| NLB/71/925 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 7 December 1928 |
| NLB/72/372 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 29 August 1929 |
| NLB/68/652 | Copy letter from William Bate Hardy, Secretary of the Royal Society; to Sir Gerald Lenox-Conyngham, FRS | 2 October 1925 |
| RR/16/337 | Memoranda from Robert William Frederick Harrison, and reply from Joseph Larmor, on a paper 'An account of the pendulum observations made at Kew and Greenwich Observatories in 1903' by Gerald Ponsonby Lenox-Conynham | 28 July 1905 |
| EC/1918/15 | Lenox-Conyngham, Sir Gerald Ponsonby: certificate of election to the Royal Society | |
| RR/16/334 | Referee's report by William Davidson Niven, on a paper 'On pendulum observations at Kew & Greenwich' by Gerald Ponsonby Lenox-Conyngham | 4 July 1905 |
| NLB/62/503 | Copy letter from Francis Alexander Towle, Assistant Secretary of the Royal Society; to Colonel [Henry George] Lyons, Chairman of the Gassiot Committee and FRS | 23 February 1922 |
| RR/67/345 | Letter from J D Griffith Davies, Assistant Secretary of the Royal Society on a paper 'On the salinity of the surface waters of the Irish Sea' by Joseph Proudman to Gerald Ponsonby Lenox-Conyngham | 14 November 1940 |
| NLB/64 | New Letter Book volume 64, copy letters sent from Royal Society administration | 19 January 1923-11 July 1923 |
| NLB/57 | New Letter Book volume 57, copy letters sent from Royal Society administration | 27 June 1919-27 February 1920 |
| RR/64/116 | Referee's report by Gerald Ponsonby Lenox-Conyngham, on a paper 'The Royal Society expedition to Montserrat, B. W. I. - The volcanic history and petrology of Montserrat, with observation on Mt Pelé, in Martinique' by A G MacGregor | 11 September 1937 |
| RR/30/60 | Referee's report by Gerald Ponsonby Lenox-Conyngham, on a paper 'The geology and physical geography of Chinese Tibet, and its relations to the mountain system of south-eastern Asia, from observations made during the Percy Sladen expedition, 1922' by John Walter Gregory and C J Gregory | [February 1924] |
| RR/66/101 | Referee's report by Gerald Ponsonby Lenox-Conyngham, on a paper 'The Earth's magnetic field in Southern Africa at the epoch, 1 July 1930' by E N Grindley | [January 1940] |
| RR/67/348 | Referee's report by Gerald Ponsonby Lenox-Conyngham on a paper 'On the salinity of the surface waters of the Irish Sea' by Joseph Proudman | 27 November 1940 |
| MC/29/156 | Letter from [Lieutenant] Colonel, [Gerald Ponsonby] Lenox-Conyngham, Superintendent of the Trigonometrical Survey, to The Secretary, The Royal Society, Burlington House, London | 15 June 1914 |
| MC/33/106 | Letter from Colonel [Gerald Ponsonby] Lenox-Conyngham, R. E., Dehra Dun, India, to The Secrertaries, The Royal Society, Burlington House, London | 29 June 1918 |