As similar temperature extremes are determined to the
b. Electrical System. Check the wires, cables,
and
subsequent plate-making and press operations, it is essential
interconnections for deterioration. Open the junction
and
that some means of temperature control should always be
outlet boxes, and examine connections for moisture
and
available. The camera itself has been designed to withstand
corrosion. Wipe connections dry, and wrap worn wires
with
extreme climate changes in storage, but may lag in equalizing
electrical tape.
its ambient temperature with that of the mobile unit when that
c. Care of Film and Copy. Store the film and copy in
unit is heated or cooled. In most instances there should be no
appropriate containers provided with airtight and waterproof
harmful temperature effects to the photo-chemistry or other
covers. Keep the containers in a cool, dry area where the
supporting operations by the time camera operation
temperature remains constant.
preparations have been completed. Environmental factors
which can contribute to possible difficulty in camera operation
d. Protective Finish. All exposed machined surfaces
are detailed in paragraph 2-40 thru 2-44.
must be wiped daily. Painted surfaces must be carefully
inspected to see that there is no rusting or pitting. Any
2-40. Operation in Extreme Cold (Below 0 F.)
corrosion should be removed and the affected area restored to
its original finish..
a. General. Extreme cold will cause thickening of
lubricants, and make most materials brittle so that they will
2-42. Operation in High Humidity
damage easily when subjected to bending or shock. If
camera and equipment have been exposed to sub-zero
a. General. Equipment used in hot, humid weather is
temperatures, they should be permitted to warm up to room
subject to rapid deterioration and fungus growth. Make
temperature before set-up and the problem of condensation
frequent inspections. Clean to prevent deterioration.
on the camera and its optics by allowing any condensation
present to evaporate. Condensation on a lens will prevent
b. Electrical System. Inspect the wires throughout the
satisfactory photography (see para. 2-40. e.). Condensation
camera for fungus. Clean affected wires thoroughly and wrap
on non-lubricated or otherwise unprotected metallic
with electrical tape. Also refer to paragraph 2-41. b.
components will induce corrosion.
b. Electrical System. Inspect wires, cables, switches,
for care of copy and film.
and all electrical connections daily for cracked insulation,
d. Lenses. Lenses are subject to deterioration in
broken wires, or shorting.
tropical humid areas principally from fungus attack. Refer to
DA Pam 310-4 for manuals covering preventive practices.
vacuum hose frequently for cracking. Make a daily check of
The lens boxes should be treated with fungicides to inhibit
hose connections at the vacuum back and copyboard for
fungus growth.
breaks.
2-43. Operation in Extreme Heat
d. Optical Components. When the lenses, focusing
glass, and diffusers have been subjected to extreme cold and
the surrounding area is being warmed up for operation,
a. Electrical System. Check the terminal boards in the
condensation may form on all surfaces as stated in a. above.
electrical boxes for base solder connections and worn contact
This condensation will evaporate by itself as the equipment
joints. Examine wires and insulation for moisture content.
warms up. Do not attempt to wipe condensation off a cold
Clean parts thoroughly and resolder defective solder joints.
lens or use anti-fog preparations as the coated surfaces of the
Wrap electrical tape around wires having worn insulation.
lens are easily damaged. Cemented lenses subjected to
extreme cold may also evidence crystallization of the bonding
sections of the vacuum flexible hose for moisture and
medium, but this, too, will revert to a plastic state as the
deterioration. Check the turbo compressor housings for
temperature rises.
corrosion and pitting. Clean parts thoroughly and remove
scaling.
2-41. Operation in Salt Water Areas
2-44. Operation in Dusty or Sandy Areas
a. General. During inspections, check the camera
drivescrews and lensboard control shafts for pitting. Examine
If the copying camera is installed and operated in a dusty or
the counter drive chains and counterbalance chains for
sandy area, it must be in a closed shelter where it will be free
moisture. Clean these parts as often as necessary to prevent
of particles affecting its operation. The camera will not
corrosion
and
insure
satisfactory
operation
operate if grit, sand, or dust accumulates on the camera rail,
copyboard, and lensboard, or in the turbo-compressors or
drive motors. Grit or other abrasive materials adhering to
lens or screen surfaces should be carefully dusted off with a
clean camel's hair brush. Do not wipe off with a rag or tissue,
as the grit will imbed itself in the material and scratch the
glass surface.
2-18
