| Reference number | Title | Date |
| NLB/2/993 | Copy letter from Herbert Rix, to Professor Henry Hennessy, Fellow of the Royal Society | 23 January 1889 |
| NLB/3/303 | Copy letter from Herbert Rix, to Dr William Pole, Fellow of the Royal Society | 4 May 1889 |
| NLB/3/360 | Copy letter from Herbert Rix, to [John William Strutt] Lord Rayleigh, Secretary, Royal Society | 20 May 1889 |
| NLB/7/761 | Copy letter from Herbert Rix, to Professor Arthur William Rucker | 20 April 1893 |
| NLB/11/147 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 2 May 1895 |
| NLB/17/41 | Copy letter from Theodore E James, to Messrs Harrison & Sons | 7 July 1898 |
| RR/2/101 | Second referee's report by William Hopkins, on a paper 'Researches in terrestrial physics.-Part II' by Henry Hennessy | 30 May 1851 |
| RR/10/272 | Referee's report by William Pole, on a paper 'On the conditions for effective scour in drain-pipes of circular section' by Henry Hennessy | 6 April 1889 |
| AP/69/8 | Unpublished paper, 'On the flotation of solid bodies in liquids of less density than the solids' by Henry Hennessy | 1893 |
| RR/2/96b | Referee's report by William Hopkins, on a paper 'Researches in terrestrial physics.-Part II' by Henry Hennessy | 4 April 1851 |
| AP/66/9/2 | Unpublished diagram, drainpipe cross-section by Henry Hennessy | 1889 |
| RR/10/273 | Second referee's report by William Pole, on a paper 'On the conditions for effective scour in drain-pipes of circular section' by Henry Hennessy | 18 May 1889 |
| IM/Maull/002038 | Hennessey, Henry | nd |
| RR/10/271 | Referee's report by William Cawthorne Unwin, on a paper 'On the conditions for effective scour in drain-pipes of circular section' by Henry Hennessy | 9 March 1889 |
| EC/1858/09 | Hennessy, Henry: certificate of election to the Royal Society | |
| PT/42/9/2 | Plate, diagram of formation of strata of shell by [Henry Hennessy] | [1849] |
| AP/66/9 | Unpublished paper, 'On the conditions for effective scour in drain pipes of circular section' by H [Henry] Hennessy | 1889 |
| RR/5/115 | Letter from Humphrey Lloyd, on a paper 'On the synchronous distribution of temperature over the earth's surface' by Henry Hennessy to George Gabriel Stokes | 25 June 1864 |
| PT/42/8 | Paper, 'The figure and primitive formation of the earth or part I of researches on physical geology' by Henry Hennessy | [1846] |
| MC/4/278 | Letter from Henry Hennessy, 13 North Mall, Cork, to [Samuel] Hunter Christie, [Secretary of the Royal Society] | 2 April 1849 |
| MC/4 | Volume 4 of miscellaneous correspondence regarding business matters, sent to the Royal Society | 1844-1850 |
| PT/42/9 | Paper, 'Researches in physical geology, Part II' by Henry Hennessy | [1849] |
| PT/42/9/1 | Manuscript, 'Researches in physical geology, Part II' by Henry Hennessy | [1849] |
| AP/33/16 | Unpublished letter, regarding the stability of the Earth's axis of rotation from Henry Hennessy to Sir J W [John William] Lubbock | 1 November 1851 |
| AP/44/4/2 | Unpublished diagrams, the Earth's magnetic field by Henry Hennessy | 1862 |
| AP/44/4 | Unpublished paper, 'On the simultaneous distribution of heat throughout the superficial parts of the Earth' by Henry Hennessy | 1862 |
| AP/44/4/1 | Unpublished manuscript, 'On the simultaneous distribution of heat throughout the superficial parts of the Earth' by Henry Hennessy | 1862 |
| RR/2/102 | Referee's report by unnamed referee, on a paper [attributed] 'Researches in terrestrial physics.-Part II' by Henry Hennessy | nd |
| AP/66/9/1 | Unpublished manuscript, 'On the conditions for effective scour in drain pipes of circular section' by H [Henry] Hennessy | 1889 |
| PP/7/11 | Paper, 'On the geometrical construction of the cell of the honey bee' by Henry Hennessy | 1885 |
| PP/9/14/1 | Manuscript, 'Note to a paper on the geometrical construction of the cell of the honey bee' by Henry Hennessy | 1886 |
| PP/9/14/2 | Diagram, geometrical diagram by Henry Hennessy | 1886 |
| PP/10/14 | Paper, 'Problems in mechanism regarding trains of pulleys and drums of least weight for a given velocity ratio' by Henry Hennessy | 1887 |
| PP/12/2/1 | Manuscript, 'Hydraulic problems on the cross-sections of pipes and channels' by Henry Hennessy | 1888 |
| PP/12/2 | Paper, 'Hydraulic problems on the cross-sections of pipes and channels' by Henry Hennessy | 1888 |
| PP/12/2/2 | Diagrams, geometrical diagrams by Henry Hennessy | 1888 |
| PP/13/7 | Paper, 'On the maximum discharge through a pipe of circular section when the effective head is due only to the pipe’s inclination' by Henry Hennessy | 1888 |
| PP/9/14 | Paper, 'Note to a paper on the geometrical construction of the cell of the honey bee' by Henry Hennessy | 1886 |
| RR/5/113 | Referee's report by William Hopkins, on a paper 'On the simultaneous distribution of heat throughout superficial parts of the earth' by Henry Hennessy | 10 November 1862 |
| RR/5/114 | Letter from Humphrey Lloyd, on a paper 'On the simultaneous distribution of heat throughout superficial parts of the earth' by Henry Hennessy to George Gabriel Stokes | 19 November 1862 |
| RR/5/116 | Referee's report by John Frederick William Herschel, on a paper 'On the synchronous distribution of temperature over the earth's surface' by Henry Hennessy | 12 June 1865 |
| RR/2/96a | Committee of Papers referrals, for a paper 'Researches in terrestrial physics.-Part II' by Henry Hennessy and a paper [attributed] 'General methods in analysis for the resolution of linear equations in finite differences and linear differential equations' by Charles James Hargreave | 19 April 1849 |