(2) 8" x 10" focusing back. The 8" x 10" focusing back is
interchangeable with the 4" x 5" focusing back [(1) above]. The focusing
panel shield is secured within the focusing back by a screw in each corner.
A ground focusing glass is mounted within the focusing panel shield.
Horizontal and vertical lines on the ground focusing glass provide a scale
to align the image.
d. Front movement mechanisms. The front movement mechanisms provide
the facilities for horizontal movement or for the vertical movement of the
lens assembly. Each mechanism consists of a guide bar (figure 2) that runs
the full length of the carriage bed, a handle grip, and a gear arrangement.
e. Handwheel assemblies. Two handwheel assemblies are provided for
movement of the camera carriages. The handwheels (front and rear) (figure
2), through a system of cable reels and wire ropes, move the camera
FIGURE 2. Camera, showing location of controls, partial view.