1888 reference for the rear focusing pattern; based on
the Scovill Acme View Box pattern.
The text states that the revolving back has an
advantage in that "the ability to draw the slide to the
left enables the photographer to obtain a view which
he could not get with the usual provision in a camera."
Flammang's Patent Revolving Back Cameras
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1892 reference for the front focusing pattern; based
on the St. Louis Reversible Back pattern.
1883 patent illustration for a revolving back submitted
by Mathias Flammang. The patent application describes
in detail the camera design, features, and benefits.