damage. Whenever possible, inclose the
covered equipment in water-
repellent material before transferring it
from the cold storage area to
room temperature. The water-repellent
material over the protective
covering should decrease the possibility
of water condensing" on the
b. Before operating the equipment, clean and dry the glass projec-
tion lens in accordance with the procedure described in paragraph 22.
Then turn the projection lamp and blower on for 10 or 15 minutes to
evaporate any remaining moisture.
19. Tropic and Desert Areas
a. If it is necessary to store the projector outdoors in very high
temperatures, cover it with a shelter cloth to protect it from dust.
b. Before using the equipment in desert regions, use a soft bristle
brush to clean any sand or dust from the housing. Open the side access
door and brush dirt and sand from the inside of the projector, the
rear surface mirrors, the reflector, and the projection lamp. Use a
soft camel's-hair brush and carefully dust the projection lens, the front
surface mirror, and the pointer assembly lenses and mirrors.
c. Under conditions of high humidity, inspect th~ equipment for
traces of fungus, mold, and metallic corrosion. Remove all traces
immediately. Refer to TB SIG 149, Tropicalization of Photographic
Equipment, for further information on this subject.