Désiré van Monckhoven
Désiré Charles Emanuel van Monckhoven (1834–1882) was a Belgian chemist, physicist, and photographic researcher. He was also an inventor and author. Background
Monckhoven studied chemistry and lived at Ghent, in the Flemish Region of Belgium. At 18 he published his Traite general de pbotographie, In 1862 he published Traite populaire de photographie sur collodion. He introduced the dialytic enlarger and in 1864 made improvements to David Acheson Woodward's solar camera used for making photographic enlargements. Monckhoven also studied photographic optics, publishing Photographische Optik, in 1866. In 1867 he moved to Vienna and set up a studio with portrait photographer Rabending before returning to Ghent in 1870. Here he set up a laboratory where he carried out experiments in the ripening of gelatine silver bromide. Instruction sur le procede au gelatino-bromure d' argent was published in 1879 and Du gelatino-bromure d' argent in 1880. Works 
He wrote several of the earliest books on photography and photographic optics. His original French works were later translated to English and other languages. He invented or developed an enlarger (1864), a dry collodion process (1871), improvements of the carbon print process (1875–80), and improved silver-bromide gelatine emulsions. Selected work
 1857 – Méthodes simplifiées de photographie sur papier (Simplified methods of photography on paper). Paris : Marion. 1858 – Procédé nouveau de photographie sur plaques de fer: et notice sur les vernis photographiques et le collodion sec (A new process of photography on ferrous plates). Paris : A. Gaudin. OCLC 7011879
 1862 – Traité populaire de photographie sur collodion. Paris: Lieber. OCLC 17454826
 1863 – A Popular Treatise on Photography: also A description of, and remarks on, The stereoscope and photographic optics (tr. W.H. Thornthwaite) London: Virtue Brothers. OCLC 17368038  See  excerpt transcription
 1867 –  Photographic Optics; Including the Description of Lenses and Enlarging Apparatus. London: Robert Hardwicke. OCLC 5332903 – reprinted by Arno Press, New York. OCLC 4642259

See also
 Diaphragm (optics)
 Ghent University
 History of the camera
 Royal Photographic Society

Notes

References
 Beach, Frederick Converse. "Modern amateur photography," Harper's Magazine. January 1889. pp. 288–297. Day, Lance and Ian McNeil. (1996). Biographical Dictionary of the History of Technology. London: Taylor & Francis. Hannavy, John. (2008). Encyclopedia of Nineteenth-century Photography. London: CRC Press. "The Late Dr. Van Monckhoven," Nature. Volume 26, Issue 677, pp. 601– 602 (October 1882). External links
 Monckhoven biographical note
  Exhibitions of the Royal Photographic Society, 1870–1915:   Exhibitor records, Dr. van Monckhoven, 1877

Optical engineers
Belgian physicists
Belgian chemists
19th-century Belgian inventors
1834 births
1882 deaths
Ghent University alumni