g.
Copyboard Assembly. Attached to
f. Transparency Holder Assembly. The transparency
the axle and tube assembly (3, fig. 1-6) and
holder (1, fig. 1-2) and its related parts are located at the end
opposite the transparency holder is the
of the camera opposite the camera back (5) and the
copyboard (5), a rectangular member with a
lensboard (4). Its main structure is the transparency holder
series of perforated holes on the front panel.
housing (2, fig. 1-6) bolted to the axle and tube assembly (3),
The copyboard is fastened to the axle and
which permits a pivoting motion of both the copyboard (5) and
tube assembly by two hand knobs (6), which
the transparency holder. The face of the holder is a 5/ 16 inch
fit into the grooves of the copyboard flange
polished plate glass diffuser (12, fig. 4-22) which covers an
(4) to hold the copyboard secure. Since the
inner glass diffuser (13) of equal size. The top and bottom
faces of the transparency holder and
sections of the holder are identically equipped with a slide bar
copyboard are of equal distance from the
(14, fig. 1-6) to hold the aerial film brackets (1). The inside of
center of the axle and tube assembly, either
the transparency holder consists of a light box assembly (12)
can be rotated into the same photographic
which is in itself, an independent unit housed like a sliding
plane.
The axle and tube assembly is
door. The transparency holder has internal air passages, with
supported by, and pivots on, two copyboard
corner openings in the glass diffusers, so that suction can be
frames (8) bolted and pinned to the carriage
applied to the transparency by pulling out diverter knob (13).
base plate (10). This assembly is similar in
function to the lensboard assembly, having
its own drive motor (8, fig. 1-4), control
switch (11), and handwheel (9) for horizontal
movement on the camera rail.
h.
Vacuum Turbo-Compressor Assembly. The
vacuum back and the copyboard have identical but separate
vacuum sources. The basic unit for the vacuum sources is
the turbo-compressor assemblies (6 and 8, fig. 1-7) located
on the extreme copyboard end of the camera.
The
turbocompressor assemblies are mounted separately, each
on four vibration mounts (7) bolted to the camera skid. Each
assembly has a induction start, induction run motor (5 and 9)
attached to its housing frame.
The copyboard turbo-
compressor is equipped with a flexible rubber hose (9, fig. 1-
(1) and copyboard (2). Vacuum is supplied to the camera via
a connecting pipe (8) on the camera skid which connects to
the compressor and camera back with flexible rubber hoses
(10, fig. 12).
KEY to fig. 1-6:
1. Aerial film brackets
2. Transparency holder housing
3. Axle and tube assembly
4. Copyboard flange
5. Copyboard
6. Hand knob
7. Copyboard vacuum operating knob
8. Copyboard frame
9. Transparency holder light switch
10. Copyboard carriage base plate
11. Copyboard vacuum control switch
12. Light box assembly
13. Diverter knob
14. Slide bar
Figure 1-6.
Transparency holder and copyboard
15. Aerial film bracket crank
connections.
1-5
