London: George Knight and Sons, 1850. Fourth edition. 16mo., 60 pp., illustrations in text, 4 pp. adverts. Original printed paper wrappers. The front wrapper bears the contemporary signature of the original owner and is moderately soiled, with wear and partial separation at the spine. The lower tips of several text leaves are creased. A near very good example, housed in a newly made cloth with paper labels pamphlet case. Item #52069
Initially written by George Thomas Fisher, Jr., and published in 1843 by George Knight in two parts, the first concerned with the paper process, the second with the daguerreian; both with greatly reduced texts. By 1845, the two parts were separated and published independently, and together. In 1848, after Fisher's death, Robert J. Bingham is listed as the author, and the manuals were expanded with new advances in the processes. This 1850 edition is called the fourth edition, as was the 1848 printing.
See Gernsheim, INCUNABULA OF BRITISH PHOTOGRAPHIC LITERATURE, No. 682, and Roosens and Salu No. 6367 which fail to note this 1850 fourth edition. All editions of this work are rare, with WorldCat locating only two copies dated 1850, but both are the fifth edition.