This is an Electro-Ampliscope de CHAUVIN & ARNOUX, introduced during the 60's. It was made to evaluate the focus and speed in the laboratory for black and white pictures.

There is a notice CHAUVIN & ARNOUX : la LX-512, as a proof of its selling.

I'm looking for everybody who can tell me more about this object and the way it was designed to work.

Thank you.