(6) The complete carriage stepping assembly travels parallel to the film plane
along two wayrods. A tandem arrangement of two linear ball bushings and a set of
ball bearings guide the carriage on the wayrods. The carriage is moved by a
stepping motor, cable, and pulley arrangement.
(7) The 45-degree scan mirror is attached to the carriage casting with an
elastic type adhesive which allows canting of the mirror to obtain perpendicularity.
The canting is obtained with three jack screws through the carriage butting into the
back of the mirror. Once adjustment has been made, epoxy is applied to the mirror
mounting. Field adjustment is not normally required.
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