shaftand cross shaft (6) are jointed by a block (8) and two
c. Cleaning and Inspection. Always keep lens covered when
adjustment screws (7) serving as locks.
not in use. Avoid touching lens surfaces. Clean only if
accumulated dust or accidental fingerprints necessitate it. To
b. Removal
clean, first dust with a clean camel's hair brush. If markings
(1)
Remove the flash lamp switch (para. 4-22. a.).
persist, breathe lightly on the lens and wipe lightly with a clean
lens tissue. Discard tissue after each use. Inspect the lens
(2) Loosen screw (15, fig. 4-4), remove glass
thoroughly for scratches, broken or bent diaphragm opening
retainer and face glass from the lamp reflector ( 1). Unscrew
control, and damaged barrel. If lens is defective, regardless of
the lamp bulb.
how slight the damage, report the condition to the proper
authority. If internal lens surfaces are stained or dirty, or inner
(3) Loosen adjustment screw (7), holding cross
elements are loose, also report condition to the proper authority
shaft (6) to joint block (8), and remove shaft.
to obtain qualified servicing. Do not attempt to disassemble
(4)
Unscrew cross shaft from lamp bracket (5).
lens, as the components are critically spaced and aligned, and
the lens elements may distort under excessive pressure.
(5) Remove drive pin (12) to release tension on
CAUTION
spring (11). Remove drive pin (12) in collar (13) and remove
Never use any solution on the lens and
collar, pivot collar (14), and spring (11) from pivot shaft (9).
never oil the diaphragm or other lens
(6)
Remove pivot shaft from lensboard side frame.
mechanism.
c. Cleaning and Inspection. Clean parts with a cleaning
solvent, using a soft, clean cloth, and dry parts thoroughly with
a soft, dry cloth. Dry spring and inner surfaces of the collars
35. c. (1).
and joint block. Inspect parts for bends, cracks, and
4-41. Lens, 24 Inch
corroded surfaces. Examine the flash lamp socket for broken
a. Description. The 24 inch Goerz apochromat Artar
contacts and wiring. Check reflector, face glass, and retainer
process lens is equipped with a lens cap (2, fig. 2-12), a
for damages. Replace all defective parts.
detachable lens mounting plate (6), and a lens box (1). A
d. Installation.
holding ring (5) with the lens mounting plate is used to lock the
lens firmly in operating position. The diaphragm opening
(1) Insert the pivot shaft (9, fig. 4-4) into the
control (4) is a ring attached on the barrel of the lens.
lensboard side frame. Install the spring (11), pivoting collar
(14), and collar (13).
mounting plate 15in a counterclockwise direction to release it
(2) Replace drive pin (12) in collar (13) to lock
from the inner lensboard frame (4).
position of pivot shaft.
(3) Insert end of spring (11) in pivoting collar (12),
and move collar to center of shaft. Hold pressure of spring,
(2).
align holes and replace drive screw (12).
(4) Install the lamp bulb in reflector (1). Seat the
4-42. Flash Lamp Assembly
face glass in retainer (16), and position glass and retainer on
rim of reflector. Screw on reflector to lock face glass in place.
a. Description. The flash lamp assembly (fig. 44) consists of a
flash lamp fixture mounted on a spring-loaded pivot shaft (9)
(5) Thread the cross shaft (6) into the detached
which operates from and is supported by the lensboard side
lamp bracket (5). Insert cross shaft into the joint block (8) and
frame. The lamp reflector (1) houses a standard medium screw
lock with adjustment screw (7).
base bulb which is protected by an opal-colored face glass
(6) Assemble and install the flash lamp switch as
contained in the retainer (16) of the reflector. The pivot shaft
detailed in paragraph 4-22. b.
controls the motion of the flash lamp through a spring (11),
pivoting collar (14), and adjustment screw (10). The pivot
Section XII. MAINTENANCE OF CAMERA DRIVE SYSTEM
and backward on the camera rail. The units are vertically
4-43. Description
mounted on separate motor support bracket (17, fig. 4-2) bolted
The camera drive system consists of the lensboard drove motor
to the back support plate 18) of the camera back.
(6, fig. 1-4) and the copyboard drive motor (8), both identical in
physical appearance and electrical rating. The motors are
reversible and can move the lensboard or copyboard forward
4-24
