Latticed window in the south gallery of Lacock Abbey, Wiltshire, Aug 1835.

Photogenic drawing negative by William Henry Fox Talbot (1800-1877). Taken with the Camera Obscura, this photograph is the earliest camera negative in existence. Several different sized images of this view exist, testifying to Talbot's attempts to reduce exposure times. Talbot invented the first negative/positive proces between 1835-1839, patenting it as the calotype proces in 1841. For the first time any number of prints could be made of a single image, from the negative. Lacock, Talbot's family home, now houses a photography museum and is open to the public.