Schaub was a prolific inventor. From 1898 to 1944, he
applied for and was granted 33 U.S. patents; of which only
three were related to photography.
Above left and right. Patent pages 1 and 2 illustrate
Schaub's unique multiplying camera design. The patent also
describes a tripod head to change the camera orientation
because the back is non-reversing.
The patent describes a camera capable of making 24
exposures on a plate; while the multiplying camera presented
on this website appears to be an improved version with a
reversing back (the tripod head is no longer needed) and
reversing ground glass assembly.
Hardware registration, wood construction, and wood finish
also changed. The 'improved' version has a darker reddish
finish in comparison to two other known examples that make
24 images and have a light colored wood finish.
Left. A cross section of the camera body is shown on the
third page. Schuab used a lens tube with slots cut into the
barrel for focusing. On inspection of my camera, it appears
that a 1/9-tube (petzal formula) was used. This probably
lowered the cost of production since this type of lens was
As a note, Jacob Schaub also patented two plate holders;
Nos. 603,972 (May 10, 1898) and 771,939 (Oct. 11, 1904).
The 1898 patent holder has an outward appearance typical
of designs at the time. In contrast, the later 1904 holder has
additional hardware to hold the plate.