A unique film format for amateur use. Instead of perforations, the film has an open notch on either side between each frame. The Mirographe uses a novel pull-down mechanism in which a snail cam (partly circular, partly spiral) drags each frame into the gate by the notch (see image 4). The film is motionless while the circular part of the cam passes through the notch, then is pulled down as the radius of the cam decreases. After one complete turn of the cam, the radius increases abruptly, catching the next notch at the same time as the previous notch is released. The camera also acts as a projector.