Salt print depicting "The Old Gamekeeper", from a calotype negative exposed in an early camera, by W.H. Fox Talbot, 1840s

Salt print depicting masons working on The Scott Monument, from a calotype negative by David Octavius Hill and Robert Adamson, 1843

Salt print of a group of 92nd Highlanders and a drummer in Edinburgh Castle, from a calotype negative by David Octavius Hill and Robert Adamson, 1845 - 1846

Salt print, Plate I, 'Part of Queen's College, Oxford', mounted, from Part 1 of 'The Pencil of Nature', by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated 4 September 1843, published 24th June 1844

Salt print, Plate 1, 'Part of Queen's College, Oxford',, unmounted image, from original copy of 'The Pencil of Nature', by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated 4 September 1843, published 24th June 1844

Salt print, Plate III, 'Articles of China', mounted image, from Part 1 of 'The Pencil of Nature', originally titled, 'Articles of China with a Dark Background' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated prior to January 1844, published 24th June 1844

Salt print, Plate IV, 'Articles of Glass', mounted image, from Part 1 of 'The Pencil of Nature', originally titled, Articles of Glass with a Dark Background' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated prior to June 1844, published 24th June 1844

Salt print, Plate VI, 'The Open Door', unmounted image, from Part 2 of 'The Pencil of Nature' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated prior to May 1844, published 29th January 1845

Salt print, Plate VII, 'Leaf of a Plant', mounted image, from Part 2 of 'The Pencil of Nature' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated prior to 14 February 1844, published 29th January 1845

Salt print, Plate XIII, 'Queen's College, Oxford, Entrance Gateway', mounted image, from Part 3 of 'The Pencil of Nature' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated 9 April 1843, published 14-29th May 1845

Salt print, Plate XIV, 'The Ladder', mounted image, from Part 3 of 'The Pencil of Nature' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated prior to April 1845, published 14-29th May 1845

Salt print, Plate XVI, 'Cloisters of Lacock Abbey', unmounted image, from Part 4 of 'The Pencil of Nature' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated 1842, published 21 June 1845

Salt print, Plate XVII, 'Bust of Patroclus', mounted image, from Part 4 of 'The Pencil of Nature' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated 9 August 1842, published 21 June 1845

Salt print, Plate XVII, 'Bust of Patroclus', unmounted image, from Part 4 of 'The Pencil of Nature' by William Henry Fox Talbot, Lacock, Wiltshire, England, calotype negative dated 9 August 1842, published 21 June 1845

Salt print depicting St Andrews Harbour, from a calotype negative by David Octavius Hill and Robert Adamson, 1843 - 1848, included in Dr John Adamson's photograph album

Salt print depicting Robert Adamson, from a calotype negative by Dr John Adamson, 1844, included in Dr John Adamson's photograph album