all exposure times (other than flash) will be proportionately
(b) Slide the brackets just enough to
greater in direct ratio to the relative light intensities received
accommodate length of film spool.
by the negative. If the transparency is small or does not cover
(c) Insert film spool on brackets, adjusting
most of the light area of the holder, the surrounding areas
position of brackets to suit.
should be masked with black paper to prevent extraneous
light from fogging the negative.
(d) Tighten bracket lockscrews (3).
b. Aerial Roll Film.
(e) Place aerial film brackets on slide bar
(1)
Aerial film bracket placement.
at base of transparency holder, as outlined in steps (a), (b),
and (d) above.
(a) Place the aerial film brackets in slot of
slide bar, as shown in figure 2-16.
(2)
Film placement.
(a) Draw film from spool over roller (1),
across diffuser glass, over other roller, and engage into slot in
take-up spool. Release brackets and centralize spools so that
film will feed true across the center of the transparency holder.
Tighten brackets. Wind film until frame to be reproduced is
centered on the transparency holder.
Note
It
is
recommended
that
the
transparency holder glass be covered
with a black paper mask, having an
opening equal to the frame size plus
marginal data to improve the quality
of the reproduction. The mask can be
attached with tabs of self-adhesive
tape along the margins but should
not block the suction openings at the
corners.
(b) Tighten the crank lockscrews (4).
(c) Place plastic cover over transparency
and switch on copyboard vacuum control switch (11, fig. 1-6)
so that the vacuum will flatten the plastic cover and film
1.
Roller
against the glass of the transparency holder.
2.
Slide bar
(3) Diaphragm settings and exposures. Refer to
3.
Bracket lockscrew
paragraph 2-38. a. (5).
4.
Crank lockscrew
5.
Slide bar slot
6.
Aerial film bracket
Figure 2-16. Attaching aerial film bracket.
Section V OPERATION UNDER UNUSUAL CONDITIONS
2-39. General
b While the copying camera may be subjected to
extremes in temperature during storage or transit, it will
a. Special instructions for operating and servicing the
seldom be operated below 50 F. or above 125 F. as the
copying camera under unusual conditions are contained in
this section. When repeated failure of material results from
associated photographic processing of the exposed film will
subjection to extreme conditions, a report of the failure should
not develop at low temperatures and will cause excessive fog
be made to the proper authority. The information presented
at high temperatures.
pertains to the equipment as installed in an enclosed shelter
where it may be subjected to extreme climatic conditions.
2-17
