Box camera
The box cameras are the oldest class of photographic cameras. The first camera ever used for making persistent photographic images was the big wooden box camera that Nicéphore Niépce used for experimental photography in the mid-1820s. When Louis Jacques Mandé Daguerre joined his developments of new photographic processes they already used box cameras with iris diaphragm. Some years later William Henry Fox Talbot made his photographic experiments. He had a whole series of little box cameras ("mousetraps") to be able to make several exposures on one sunny day - exposure times were very long in those pioneering days.
When Daguerre could present a photographic process with acceptable exposure times in 1839 he made plans for a very heavy wooden box camera that became the model for many early photographic cameras: A box with an open back, and a hole in the middle of the front to mount a lens or a diaphragm and a lens. Shutters were not needed, the lens cap was sufficient. A second box with open front side held in its back the light sensitive plate in its holder, or the focusing ground glass instead. The second box had to be pushed like a drawer into the outer box. Focusing was made with wide aperture and ground glass in the back by shifting the inner box for- or backward until the image subject appeared sharp. Since the sliding drawer should not hang in its position the bottom plate of the outer box was elongated so that the inner box was always moved on this plane.
