One of a group of ten original calotype photographic prints; calotype print by William Henry Fox Talbot of the Colloseum in Rome, Italy, by Calvert Jones

One of a group of ten original calotype photographic prints; calotype print by William Henry Fox Talbot of an engraving of a bridge by Dore

One of a group of ten original calotype photographic prints; calotype print of a bridge by William Henry Fox Talbot from Sun Pictures in Scotland

Calotype print of The Reverend Calvert Jones in the cloisters of Lacock Abbey, by William Henry Fox Talbot, c 1843

One of a group of ten original calotype photographic prints; calotype by William Henry Fox Talbot of two men under an archway

One of a group of ten original calotype photographic prints; calotype by William Henry Fox Talbot of part of a church or college

One of a group of ten original calotype photographic prints; calotype print by William Henry Fox Talbot ceramic ornaments

One of a group of ten original calotype photographic prints; calotype print by William Henry Fox Talbot of lace (negative image)

One of a group of ten original calotype photographic prints; calotype print by William Henry Fox Talbot of 'The Flower sellers'

One of a group of ten original calotype photographic prints; calotype print of a tree in winter by William Henry Fox Talbot

Salt print depicting the west side of Durham Cathedral, from a calotype negative by David Octavius Hill and Robert Adamson, with a Thomas Davidson large-format camera, 1844

Calotype of the south door of York Minster, dated 1844, from David Octavius Hill and Robert Adamson's Royal Scottish Academy Albums

Salt print depicting Sir Charles Lyell, from a calotype negative by David Octavius Hill and Robert Adamson, 1844 - 1848

Calotype depicting St Rule's Tower, St Andrews, viewed from the north, part of an album of calotype photographs compiled by Dr John Adamson, early 1840s - 1870

Positive of a photogenic image of a letter from Sir Isaac Newton to Dr Edmond Halley (1724/25), by Dr John Adamson, c. 1840, included in Dr John Adamson's photograph album

Calotype depicting leaves, negative impression, part of an album of calotype photographs compiled by Dr John Adamson