| RefNo | Title | Date |
| EC/1840/09 | Caldecott, John: certificate of election to the Royal Society | |
| MS/257/1/275 | Copy of letter from the Rajah of Travancore to John Caldecott | 4 January 1843 |
| MS/257/1/264 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine, London | 14 October 1841 |
| MS/257/1/270 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine | 19 June 1843 |
| MS/257/1/266 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine | 10 November 1841 |
| MS/257/1/260 | Letter from John Caldecott, Suez to Edward Sabine | 20 February 1841 |
| MS/257/1/263 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine | 15 September 1841 |
| MA/254 | Magnetic and meteorological observations at the Trivandrum Observatory, India, by John Caldecott | 29 May 1841-31 March 1842 |
| MS/119/2/111 | Letter from John Caldecott, Trivandrum Observatory to Humphrey Lloyd, Trinity College, Dublin | 13 February 1842 |
| MS/257/1/261 | Letter from John Caldecott, At sea near Aden to [Edward Sabine] | 4 March 1841 |
| MS/257/1/269 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine, Somerset House | 2 July 1842 |
| MS/257/1/262 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine | 5 June 1841 |
| MS/257/1/258 | Letter from John Caldecott, Barcelona to [Edward Sabine] | 13 December 1840 |
| MS/257/1/268 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine | 16 April 1842 |
| MS/257/1/265 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine | 20 October 1841 |
| MS/257/1/267 | Letter from John Caldecott, [Thiruvananthapuram] 'Travandrum' to Edward Sabine | 15 February 1842 |
| MS/257/1/276 | Copy of a letter from John Caldecott, Travandrum to the Rajah of Trancore; Copy of a letter from Genereal Cullen to John Caldecott | 6 January 1843; 11 January 1843 |
| MS/257/1/259 | Letter from John Caldecott, Cairo to Edward Sabine, London | 13 February 1841 |
| MA/254/36 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-28 February 1842 |
| MA/254/15 | Memorandum on meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | n.d. [1841] |
| MA/254/17 | Meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1 August-30 September 1841 |
| MA/254/5 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 21 January 1842 |
| MA/254/29 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-31 December 1841 |
| MA/254/13 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 28-29 August 1841 |
| MA/254/11 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 22-23 July 1841 |
| MA/254/1 | Description of the Trivandrum Magnetic Observatory, India, by John Caldecott | October 1841 |
| MA/254/2 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by [John Caldecott?] | 18 August 1841 |
| MA/254/3 | Memorandum for the Royal Society, accompanying the Trivandrum Magnetic Observations for June, July & August 1841, by John Caldecott | 15 September 1841 |
| MA/254/4 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | June-December 1841 |
| MA/254/6 | Observations and experiments for obtaining the dip at Trivandrum, by John Caldecott | 14 October 1841 |
| MA/254/9 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 24-25 June 1841 |
| MA/254/7 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 29-31 May 1841 |
| MA/254/14 | Meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1 August-30 September 1841 |
| MA/254/16 | Meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1 August-30 September 1841 |
| MA/254/10 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-31 July 1841 |
| MA/254/8 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-30 June 1841 |
| MA/254/12 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 2-31 August 1841 |
| MA/254/18 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-30 September 1841 |
| MA/254/19 | Meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1 August-30 September 1841 |
| MA/254/20 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 23-24 September 1841 |
| MA/254/21 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-30 October 1841 |
| MA/254/22 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 21-22 October 1841 |
| MA/254/23 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-30 November 1841 |
| MA/254/24 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 8-10 November 1841 |
| MA/254/25 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-30 November 1841 |
| MA/254/26 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-30 November 1841 |
| MA/254/27 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 27-28 November 1841 |
| MA/254/28 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-31 December 1841 |
| MA/254/30 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 23-24 December 1841 |
| MA/254/37 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 25-26 February 1842 |
| MA/254/32 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-31 January 1842 |
| MA/254/35 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-28 February 1842 |
| MA/254/33 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 20-21 January 1842 |
| MA/254/31 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-31 January 1842 |
| MA/254/34 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-28 February 1842 |
| MA/254/39 | Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-31 March 1842 |
| MA/254/38 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 1-31 March 1842 |
| MA/254/40 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott | 23-24 March 1842 |
| MA/254/41 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott and others | 29 May 1841-23 March 1842 |
| MA/254/42 | Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott and others | June 1841-March 1842 |