Procedure to fund images of slides in projection. (Machine-translation by Google Translate, not legally binding)

摘要

Procedure for melting images of slides in projection characterized by understanding and combining the service of, at least, two projectors of slides of any suitable automatic type, which project images alternatively depending on a pair of diaphragms obturators of antagonistic action that get in the beams luminous so that when one opens the other closes. (Machine-translation by Google Translate, not legally binding)