to avoid ^all cause of future misundstgs, Mr P. shall give to Mr T. an assurance and formal acknt that he will not consider it any infrt of his patt if Mr T. shd electype his own
kind of chr. gel. photographs & ^steel engravgs, by the ordinary electype process of electy[pe?], viz. ^by such as were publicly used and knn prior to the date of Pretch’s patent.
To avoid all cause of future misundstandings, Mr Pretsch <1> shall give to Mr Talbot an assurance and formal acknowledgement that he will not consider it any infringement of his patent if Mr Talbot should electrotype <2> his own
kind of chrome gelatine photographs and steel engravings, by the ordinary electrotype process of electroype, viz. by such as were publicly used and known prior to the date of Pretch’s patent.
2. The Patent Photo-Galvanographic Company (commonly, The Photogalvanographic Company) was based on the work of Paul Pretsch (1808–1873), Austrian photographer & inventor and former Manager of the Imperial Printing Establishment in Vienna. Located in Holloway Road, Islington, London, from 1856-1857, Pretsch took over as manager and Roger Fenton (1819–1869), photographer & lawyer, was a partner and their chief photographer. Starting in late 1856, they published a serial portfolio, Photographic Art Treasures, or Nature and Art Illustrated by Art and Nature, illustratated with photogalvanographs derived from several photographer's works. Photogalvanography was uncomfortably closely based on elements of WHFT’s patented 1852 Photographic Engraving but, unlike Talbot, the plates were heavily retouched by hand. Compounding the legal objections of Talbot, their former manager, Duncan Campbell Dallas, set up a competing company to produce the Dallastype. The company collapsed and near the end of 1860 Pretsch, out of money, allowed his patent to lapse. A public appeal was launched in 1861 to assist him but he returned to Vienna in 1863 in ill health, going back to the Imperial Printing Establishment, but finally succumbing to cholera.