This a very special gear, the Polaroid AutoProcessor 35mm.
It
allows to process 35mm Polaroid film yourself without the help of a lab
within a few minutes. The main use was to make slides for
presentations, but b&w lithographic film to present documents was
also available. This film was an attempt to use the Polavison
technology. Polavision was an instant motion picture film, introduced
in 1973, which failed commercially because of the upcoming video
systems.
Some information from Wikipedia:
"Polachrome
was an easy to develop 35 mm film, available in color, monochrome and
'blue' formats (the latter intended for making title cards). Each roll
of film came with a cartridge containing developing chemicals which
were pressed between the film and a developing strip by a hand-cranked
machine called the AutoProcessor. The AutoProcessor was very cheap and
did not require a darkroom; the results were somewhat variable, the
resolution was not as good as conventional film due to the matrix of
tiny red, green and blue filters required to make the monochrome
emulsion work in color, and the sensitivity was low, even for slide
film; in tungsten light, Polachrome CS is rated at ISO 40. It was
introduced in 1983.
Additive film (such as Polavision and
Polachrome slide film) uses a color mask of microscopically thin
transparent red, green, and blue lines (3000 lines per inch) and a
black and white emulsion layer to reproduce color images in
transparency film. The resulting dye developers (unexposed emulsion)
block the colors not needed and project the color or combination of
colors which form in the resulting image. Since the lines are so close
to each other, the human eye easily blended the primary colors together
to form the correct color, much like an LCD display or television. For
instance, a photo of a yellow flower would expose the emulsion beneath
the red and green masks and not the blue mask. The developing process
removed the exposed emulsion (under the red and green masks) and
diffused the unexposed dye developer (under the blue mask) to its
receiving layer, blocking light from coming through. This resulted in
the projected light shining through the red and green masks but not the
blue mask, creating the color yellow. Because of the film density, film
speeds were necessarily slow. High precision was required for the
production of this film."
