undercarriage, placing the object upon the copy feeding unit belt, and
raising the undercarriage as far as it will go.
When completely lowered, the undercarriage will automatically lock
and will slant slightly toward the back of the projector to be more
convenient for the insertion of the copy. The vacuum will still operate
in this position.
b. Place the copy or object on the copy feeding unit belt. Grasp
the crossbar and lilt the undercarriage above the locking position.
Do not let it fly upward because it will strike the bottom of the
projector and may damage the equiptment The undercarriage will be
held in the projection position by the springs which are attached to
the forward parallel arms. When one object has been projected and
the next is ready to be insertred, lower the undercarriage again, lift the
old copy off the projection stage, and replace it with the new material
to be projected.
Note. Thick physical objects (not lying in one plane) can be projected, hut
theoretically only one particular plane of the object can he brought to an exact
focus. However. from a practical angle. a good degree of definition can be obtained
over its entire thickness it the object is not too thick.
17. Operating the Pointer
(figs. 5 and 8)
The pointer is operated by a single pointer control knob. To operate
the pointer, (21, fig. 5) move the control knob in the direction that
you want the arrow to go. When the knob is moved forward or
backward, the arrow' will move left and right; when the knob is
turned, the arrow wiill move up or down. The image of the pointer is
projected through the small opening in the front of the projector
(fig. 2) .
Section IV.
OPERATION UNDER UNUSUAL CONDITIONS
18. Arctic Areas
Still Picture projector AP-5 (1) is not designed for operation at low
temperatures. When the equipment has been stored outdoors or in
an unheated shelter- where extreme temperatures arc encountered,
proceed as follows before operating it:
a. Move the equipment into the room in which it is to be operated
and let it remain at room temperature for approximately 6 hours
before removeing the protective covering. If the cover is removed
sooner, water may condense on the equipment and cause permanent
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