| RefNo | Title | Date |
| DM/6/81 | Copy of letter from IM Ludlow to Frank C Penrose | 25 March 1856 |
| MM/15/49 | Report by GH Darwin on a paper by FC Penrose on the orientation of a number of Greek temples | 4 March 1897 |
| MM/15/50 | Report by WHM Christie on a paper by FC Penrose on the orientation of a number of Greek temples | 31 March 1897 |
| MM/15/47 | Report by Edwin Dunkin to the Committee of Papers on a paper by FC Penrose on the orientation of a number of Greek temples | 30 January 1893 |
| MM/15/48 | Report by RS Ball on a paper by FC Penrose on the orientation of a number of Greek temples | 5 February 1893 |
| NLB/7/166 | Copy letter from Herbert Rix, to Francis Cranmer Penrose, Colebyfield, Wimbledon | 14 December 1892 |
| NLB/7/218 | Copy letter from Herbert Rix, to Francis Cranmer Penrose, Colebyfield, Wimbledon | 22 December 1892 |
| NLB/7/173 | Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer, Fellow of the Royal Society | 14 December 1892 |
| NLB/7/742 | Copy letter from Herbert Rix, to Francis Cranmer Penrose | 17 April 1893 |
| NLB/7/733 | Copy letter from Theodore E James, to Lord Rayleigh [John William Strutt] | 15 April 1893 |
| NLB/7/722 | Copy letter from Herbert Rix, to Lord Rayleigh [John Wiliam Strutt] | 13 April 1893 |
| NLB/7/1042 | Copy letter from Herbert Rix, to Francis Cranmer Penrose, Colebyfield, Wimbledon | 20 June 1893 |
| NLB/7/736 | Copy letter from Herbert Rix, to Professor Jospeh Norman Lockyer | 17 April 1893 |
| NLB/7/1047 | Copy letter from Herbert Rix, to Mr Collings | 20 June 1893 |
| NLB/7/725 | Copy letter from Herbert Rix, to Francis Cranmer Penrose | 14 April 1893 |
| NLB/7/740 | Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer, Fellow of the Royal Society | 17 April 1893 |
| NLB/7/712 | Copy letter from Herbert Rix, to Professor Joseph Norman Lockyer | 13 April 1893 |
| NLB/7/1018 | Copy letter from Herbert Rix, to J S Stuart Glennie, Athenaeum Club, S.W. | 16 June 1893 |
| NLB/8/359 | Copy letter from an unknown correspondent, to Messrs Harrison & Sons | 9 October 1893 |
| NLB/13/78 | Copy letter from Robert William Frederick Harrison, to Francis Cranmer Penrose, Fellow of the Royal Society, Coleyfield, Copse Hill, Wimbledon | 5 June 1896 |
| RR/15/232 | Referee's report by Joseph Norman Lockyer, on a paper 'Some additional notes on the orientation of Greek temples being the result of a journey to Greece & Sicily in April & May, 1900' by Francis Cranmer Penrose | 27 February 1901 |
| RR/15/231 | Referee's report by George Howard Darwin, on a paper 'Some additional notes on the orientation of Greek temples being the result of a journey to Greece & Sicily in April & May, 1900' by Francis Cranmer Penrose | 1 February 1901 |
| NLB/14/421 | Copy letter from Robert William Frederick Harrison, to Professor George Howard Darwin, Fellow of the Royal Society | 8 March 1897 |
| NLB/14/376 | Copy letter from Robert William Frederick Harrison, to Professor George Howard Darwin, Fellow of the Royal Society | 26 February 1897 |
| NLB/14/581 | Copy letter from Robert William Frederick Harrison, to Professor George Howard Darwin, Fellow of the Royal Society | 1 April 1897 |
| NLB/14/643 | Copy letter from Robert William Frederick Harrison, to Professor Arthur William Rucker, Secretary, Royal Society | 13 April 1897 |
| NLB/15/127 | Copy letter from Arthur William Rucker, to Darwin | 1 July 1897 |
| NLB/22/102 | Copy letter from Sir Michael Foster, to [Francis Cranmer] Penrose, Fellow of the Royal Society | 4 March 1901 |
| NLB/23/2/100 | Copy letter from Arthur William Rucker, to Francis Cranmer Penrose, Fellow of the Royal Society | 25 June 1901 |
| NLB/23/1/282 | Copy letter from Robert William Frederick Harrison, to Sir Joseph Norman Lockyer and Francis Cranmer Penrose, Fellow of the Royal Society | 21 October 1901 |
| RR/14/222 | Referee's report by George Howard Darwin, on a paper 'Some additional notes on the orientation of greek temples; being the result of a journey to greece and sicily in April and May, 1900' by Francis Cranmer Penrose | 13 May 1899 |
| MM/15/51 | Further comments by GH Darwin on a paper by FC Penrose on the orientation of a number of Greek temples | 6 April 1897 |
| NLB/7/1073 | Copy letter from Herbert Rix, to Mr Collings | 27 June 1893 |
| NLB/14/599 | Copy letter from Robert William Frederick Harrison, to Professor George Howard Darwin, Fellow of the Royal Society | 7 April 1897 |
| EC/1894/16 | Penrose, Francis Cranmer: certificate of election to the Royal Society | |