Camera-obscura

Dunkel-heit, /. darkness obscurity. kam-mer, /. dark room camera obscura. dunkeln, v.t. i. darken deepen, sadden (colors),... 

Staff New Projectors, Hughesnews, 1, Culver City, California (February 21, 1992). Staff Imaging Technologies, Inscribing Science, Camera Obscura, 28 (1992). Vager, Z., R. Naaman, and E.P. Kauter Coulomb Explosion Imaging of Small Molecules. Science, 426 (April 28, 1989). 

Arab doctor whose book on optics Kitab al-manazir contains the earliest extant description of a camera obscura. The Arabs discovered photosensitive substances such as silver nitrate and silver chloride that are still used in photography today. It is possible that experiments in combining the camera obscura with these chemicals were made, which would make the Arabs the inventors of photography, believed by some to be one of alchemy s longest and best-kept secrets. 

The principle of the daguerreotype is fairly simple. At its simplest, a copper plate is dipped into a silver nitrate solution, allowed to dry and then dipped into sodium chloride solution and dried to form a thin white film of insoluble silver chloride (AgCl). This plate can be placed at the rear of a camera obscura (a box totally dark inside except for light entering through a small hole covered by a lens on the outside). Exposure to light causes a chemical reaction ... 

Gemsheim and A. Gernsheim, The History of Photography From the Camera Obscura to the Beginning of the Modern Era, p. 1, Thames Hudson, London (1969). 

Camera Obscura Darkened enclosure, such as a room, with a small aperture in one of the walls that allows light in and casts an inverted image on the opposite wall. 

AC— Petrus de Alexandria describes the camera obscura (in principle, already known to Aristotle s). 

Wilgus J, WUgus B (2004) What is a camera obscura http //lnightbytes.com/cosite/ what.html. Accessed 14 July 2012... 

---