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Photographic catalogue of artefacts in the King George III Collection, Science Museum, London, with brief descriptive notes. Items include orreries, clocks and globes, thermometers and electroscopes, mechanical devices such as spring balances and levers, pneumatic pumps, microscopes and theodolites. 2 photograph albums

Correspondence between Isaac Hawkins Browne, Member of Parliament for Bridgnorth, Shropshire, and Stephen Demainbray, astronomer, concerning the gift of engineering models to King George III by George Atwood, Fellow of the Royal Society, including observations upon the involvement of William Pitt, Prime Minister, and upon the illness of King George III, 1805. 4 letters

The collection comprises manuscript notebooks, printed pamphlets, correspondence, a minute book, and photographic and other catalogues, 1768-1970. These notably include notebooks containing descriptions and viewing data relating to astronomical observations carried out at Kew Observatory, Richmond, Surrey, on behalf of King George III, with a printed pamphlet by Nevil Maskelyne, Astronomer Royal, entitled Observations of the transit of Venus over the Sun , 1768-1769; manuscript notebook containing measurements recorded during a test of the accuracy of the H5 chronometer designed by John Harrison, 1772; manuscript notebooks recording daily temperature, barometric, hygrometric and rainfall readings taken at Kew Observatory, Richmond, Surrey, 1773-1840; a printed pamphlet by George Atwood, Fellow of the Royal Society, entitled A Supplement to 'A treatise on the construction and properties of arches' (London, 1804), with manuscript dedication to King George III and related correspondence, 1804-1805; a folio signature book of visits by dignitaries to the George III Museum, 1843-1929; manuscript diary describing the work of the George III Museum including the upkeep of equipment and use of exhibits in experiments, 1850-1880; manuscript minutes of the George III Museum Committee charged with managing the collection, 1880-1885; catalogues relating to the collection, [1841-1970]; correspondence by George Calver, astronomer, relating to telescope design, 1897; series of copper plates and labels advertising the George III Museum, [1841-1926].

Printed booklet entitled Handbook of the King George III collection of scientific instruments (London, 1951) by John Anthony Chaldecott, published by the Ministry of Education on behalf of the Science Museum, London, comprising a descriptive catalogue of exhibits with photographs. 1 booklet

Letter from Stephen Demainbray, astronomer, to Isaac Hawkins Browne, Member of Parliament for Bridgnorth, Shropshire, concerning the dedication to King George III of A treatise on the construction and properties of arches (London, 1801) and its Supplement (London, 1804), by George Atwood, Fellow of the Royal Society. [1805]. 1 letter

Manuscript minutes of the George III Museum Committee charged with the management of the collection, whose members included Charles Percy Bysshe Shelley, Professor of Manufacturing Art and Machinery, and William Grylls Adams, Professor of Physics, King's College London. 1 volume

Manuscript notebook entitled 'Observations on the Transit of Venus', made at the Royal Observatory, Kew, Surrey, comprising astronomical observations with tables of viewing data, describing transit witnessed by King George III and others, 3 June 1769, with notes signed by Stephen Demainbray, astronomer. Also observations on the same transit of Venus by Abraham Gotthelf Kaestner, Professor of Mathematics and Natural Philosophy, University of Göttingen, Germany, at Göttingen Observatory, compiled 22 June 1769, and of a lunar eclipse observed by Kaestner at Göttingen, 23 December 1768. 1 volume