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Letters and picture (dated 1812-1955), documents relating to Herschel's 1839 paper, 'The Art of Photography', given to the Royal Society, (dated 1833-1979), Herschel's notebooks.

Contents:

1. Essay; 'Sound'

2. Essay; 'Light' (2nd half of essay - mostly sections on polarized light)

3. Comet orbits

4. Part III of 'On the Theory of the Moon'

5. Part I of 'Light' with doodles and a letter from Lardner.

6. A notebook for the section 'reflexion of light'

7. On letters from South

Contents:

1. Appendix to Lacroix (An elementary treatise on the differential and integral calculus by S. F. Lacroix, translated by Herschel from the French and printed in 1816.)

Contents:

1. On the Nautical Almanac (for the Board of Longitude)

Contents:

1. Mss of major part of Memoirs of the Analytical Society, Cambridge, 1813. (Not all extant)

Contents:

1. The report of the Committee for Magnetical and Meteorological Cooperation, 1843 (16 pages). Members of the 1st Committee were Dean of Ely, Dr Lloyd and Herschel.

2. The report of Sir John Herschel on the reduction of meteorological observations (21 pages)

3. A discussion of the results of 'Antartic' (sic) expedition and observations at Toronto

Contents:

1. Consideration of various points in analysis. Published (with alterations) in Philosophical Transactions (1814). 25 numbered pages.

2. On the action of crystals with two axes on homogeneous light and on the cause of the deviation from Newton's scale in the tints which they develop on exposure to a polarized ray, Philosophical Transactions 110 (1820, 45-100. Read 23 December 1819. Pages of observations and/or calculations 'with some duplicate and some miscellaneous papers'. Two drafts, included a few corrected proof sheets, of this most important paper and some notes to the printer.

3. On aberration. A draft with some proof sheets, with comparatively few corrections and annotations, but possibly important ones.

4. Observations of the apparent distances and positions of double and triple stars made in the years 1821, 1822, 1823, Philosophical Transactions 114 (1824), part 3, 1-21.

5. On the separation of iron from other metals. Draft MSS for Philosophical Transactions 111 (1821), 293-9. Read 5 April 1821.

6. MSS notes for 1824 Bakerian Lecture to the Royal Society on electricity (c. 15 – 20 leaves, heavily corrected).

7. On the development of exponential functions together with several new theorems relating to finite differences (2 copies, c. 30 pages each).

8. On the general laws of the isochromatic bands in 'chrystals', 17 April 1819 (never published). This is interleaved in the main Philosophical Transaction article, the pagination of which is most confused. There are apparently only 4 sheets, both sides each, of a very rough draft with unfinished sketches

Contents:

1. An address to the young gentleman of the mathematical classes in the south African College at the Cape of Good Hope, December 1832

Contents:

1. Hyposulphurous and Paper (Using polarized light in analysis of crystals).

2. Early 'Chrystal' paper (pre-1819).

3. History of Math (two drafts).

4. Mathematical Papers

5. On Coloured Flames (16 numbered pages, a page of sketches of curves (transmitted intensity v. colour))

6. 15 pages of 'computations for optical papers of 1820' for absorption curves and apophyllite (3 varieties), Rochelle salt

Contents:

1. Lunar Theory

2. Determination of unknown functions

3. A few pages on Law of Refraction, apparently from the History of Math article, or possibly from 'isoperimetrical problem' as these two sheets appear to have been one.

4. Isoperimetrical problem

5. On the chemical action of the rays of the solar spectrum

6. Photographic MSS, with three pages of 5 interleaved in one spot.

7. Spectra (emission? absorption?) of photographic papers

8. Notes on the art of photography or the application of the chemical rays of light to the purposes of pictorial representation. (13 leaves, 1839)