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How did roll film cameras come about?

Rolled films were the result of attempts by early adopters to create a successful replacement for heavy and relatively easy-to-break glass slides. Although the glass slides were characterized by excellent dimensional stability and consistent flatness, they were heavy when packed in their holders, bulky when carried, and prone to breakage, in addition to losing the good image afterwards. Also, the large quantities in these glass slides posed enormous difficulties in terms of preserving and storing them.

All of these aforementioned matters necessitated rapid research to find a flexible, lightweight support material, and by introducing sensitive layers based on gelatin, the need to expedite this increased. In 1871, Woodbury proposed the roll film, and four years later, L. Wamerke painted a gelatinous sensitive layer on a paper roll, then removed the acidified negative for subsequent drawing or photography, and then Pumphrey and Vebrgava came later, but the solution was not discovered. Until celluloid was introduced. In 1889, the Eastman Company, which was later called (Kodak) produced the first wrapped films supported by celluloid with opaque paper, to be packed into the camera in daylight, and then another development took place in 1903, and that was by adding Non-rollable gelatin backing

Compound exposure films have become a practical reality now and the backing paper is numbered so that the film is wrapped on a file after each exposure and the transition to the next number is done automatically by advancing the film at the correct amount for the next exposure. The number on the backing sheet can be seen through a tinted window located behind the camera.