Name
- Talbot, Ela Theresa, daughter of William Henry Fox Talbot, 1835-18932
- The Photogram, publishers, fl 1894-19002
- Tissandier, Gaston, chemist, meteorologist, aviator and editor, 1843-18992
- Vallotton, Howell Leny, landlord and fancy warehouseman, ? 1796-18582
- Whittaker and Co, booksellers and publishers, London, c 18402
- Wilts, Somerset and Weymouth Railway, 1845-18502
- Wiltshire Archaeological and Natural History Society, 1853-2
- A'Court, William Henry Ashe, 2nd Baron Heytesbury, formerly A'Court-Holmes; politician, 1809-18911
- A. Asher & Co., booksellers and publishers, Berlin, The Hague, 1830-1
- A. and W. Galignani, booksellers, Paris, 1821-18731
- Abbott, Francis, Secretary of the Scottish General Post Office, Edinburgh, b 18021
- Abel, Niels Henrik, Norwegian mathematician, 1802-18291
- Abney, William de Wiveleslie, Knight, civil servant and photographic scientist, 1843-19201
- Académie Royale des Sciences, Paris, 1666-1
- Ackermann and Co, publishers, London, 1829-18551
- Adam, Alexander Forsyth, Honorary Secretary of the Photographic Society of Scotland, 1822-18811
- Adamson, John, MD, photographic pioneer, 1809-18701
- Addams, Robert, Professor of Experimental Philosophy at The London Institution and The Royal Institution, 1789-18751
- Adolphus Richter & Co., bookseller, fl 1833-18371
- Alexander Garden, chemist, fl 1839-18621