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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Also refer to:
• The Flammang's Patent Revolving Back Camera (rear focusing pattern) page
• The Flammang's (front focusing pattern) Camera page
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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.