Improvements in photographic apparatus, especially in microphotography apparatus (Machine-translation by Google Translate, not legally binding)

摘要

Improvements in photographic equipment, especially microphotography devices, which allow two or more different types of negative film to be used in a single alternative apparatus and successively, consisting of constituting the apparatuses so that they can be coincided on the focal plane thereof one or the other of several films of different type arranged in appropriate housings in solidarity with each other and maintaining in each position the light tightness between the film or the films that are outside said position and the rest of the apparatus comprising the camera obscura and the film arranged in the focal plane. (Machine-translation by Google Translate, not legally binding)