d. Front movement mechanisms. The front movement mechanisms provide the
facilities for horizontal movement or for vertical movement of the lens
assembly. Each mechanism consists of a guide bar that runs the full length of
the carriage bed, a handle grip, and a gear arrangement. (fig 1-47).
e. Handwheel assemblies.
Two handwheel assemblies are provided for
movement of the camera carriages. The handwheels (front and rear), through a
system of cable reels and wire ropes, move the camera carriages forward and
backward as required. They are used to focus and adjust the distance between
front and rear carriages.
f. Camera bed.
The camera bed includes two tubular guide rails with an
end block at each end.
Wire rope pulleys are secured to brackets within the
end blocks.
Two connecting bars between the tubular guide rails provide
additional rigidity for the camera bed.
Figure 1-47.
Camera Controls, partial view.
47
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