(b Kent, 23 Oct 1808; d Twickenham, Middx, 21 June 1886). English photographer. The son of a surgeon with the East India Company, he was educated at Norwich Grammar School, the Royal College of Surgeons and Bethlem Hospital. During the early 1850s Diamond photographed many mentally ill women patients at the Surrey County Asylum, Wandsworth, where he was superintendent. He claimed that these photographs were used both as medical records and for self-discussion in the treatment of some patients. Throughout the 1850s his portraits of the mentally ill dominated reviews of exhibitions of photographs. His paper 'On the Application of Photography to the Physiognomy and Mental Phenomena of Insanity' was read before the Royal Society on 22 May 1856. A number of his photographs, translated into engravings and accompanied by case studies, were published in the Medical Times and Gazette. Diamond was one of the earliest photographic experimenters: in April 1839 he had made photogenic drawings (photograms) of feathers and lace. He was a close friend and the doctor of Frederick Scott Archer (1813-57), the inventor of the wet collodion process (see PHOTOGRAPHY,
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