Word: obscuras
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...Camera Obscura. In Manhattan, a camera shop carried an official bankruptcy notice in one window, its own sign in the other...
...most concise histories of photography available in English, was the Museum's librarian, Beaumont Newhall. With prints as well as actual pieces of equipment he has been able to show practically every milestone in the history of photography. Of particular interest is an 18th Century camera obscura, a box with a simple lens at one end, a ground glass screen at the other which showed an inverted image of any brightly lighted object at which it was pointed, was widely used by inept amateur painters. Other interesting pieces of apparatus: a complete outfit for sensitizing, exposing and developing daguerreotype...
...that those who wish to learn practical work as well as those who desire to know more of the technique and theory of advanced photography, such as optics, composition, bromoils, and other subjects, the services of several authorities have been obtained who will divinge the secrets of the "camera obscura...