Rapid film
Agfa's Rapid film system used 35mm film with two cartridges. It appeared in the 1960ies and was the better system for 24×24mm exposure format cameras since the film was not fixed on the film plane by the film cartridge (like in 126 film cartridges of Kodak). The camera defined the film plane, like in other 35mm or roll film cameras. The two-cartridge system should simplify film load. The film end of the new cartridge has to be layed into the camera with the film reaching the opening of a second cartridge which winds up the exposed film. Then the camera has to be closed and can be used after winding up for the first exposure. The film needs not to be rewound. The empty cartridge can be used as wind-up cartridge for the next film.
