TRIP TO(Sanitized) 1540 LIGHT TABLE PROTOTYPE PROJECT

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B05171A000400030096-5
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 10
• Document Creation Date: December 28, 2016
• Document Release Date: June 7, 2005
• Sequence Number: 96
• Publication Date: June 19, 1970
• Content Type: MFR

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CONFIDEPT'TIAL
TSSG/ESD/TEB-16--70
19 June 1970
MEMORANDUM FOR THE RECORD
I-LLEGI-13
SUBJECT: Trip to 11540 Light 25X1
Table Prototype Project
1. On 8 June 1970,1 RED/TSSG and I visited 0 XI
Ito inspect the engineering modifications
which were made on the prototype 1540 Light Table. 5X1
representatives contacted were:
Washington area representative.
Upon inspection of the equipment, it was found that all discrepan-
cies which were noted as a result of T&E and operational evaluation were
not corrected. However, the two major problems, the gross focus and Y
motion fail safe, which had caused the equipment to be unacceptable had
been redesigned. The equipment, as presently configured, is shown in
the attached photographs.
GROSS FOCUS CONTROL
The microstereoscope pod Z motion mechanism which is used to
provide gross adjustment of the optics for the different focus ranges of
the various microstereoscope., is now completely reconfigured. This
device uses a chain and sprocket method to raise and lower the pod
holder. In addition, a slip clutch is employed so that the optics
cannot be driven into the light table surface and damaged. A hand crank
is provided to change the gross focus adjustment. This control must be
rotated 3 turns to provide 1 inch of A'Z motion. The pod holder may
also be manually raised by lifting, as this motion overcomes the slip
clutch. The design of the Zmotion control appears sound from a
technical standpoint.
Y MOTION FAIL-SAFE
An acceptable fail safe for the Y carriage motion has been
incorporated. An electro-mechanical clutch, which locks up the.Y
carriage, is energized by a mercury switch when the table is tilted
2 or 3 degrees. This action can be defeated only after an aircraft
type "arming" toggle switch is energized, and an illuminated push
button, located on a panel at the right of the pod holder, is depressed.
(See photos)
CARRIAGE MOTIONS
The Y carriage motion has been improved. The original drive motor
has been replaced by a motor of greater capacity. The carriage motion
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and speed controls have been relocated on a panel at the right of, and
adjacent to the pod holder. The controls are convenient and easy to
use.
Carriage Speeds:
A. Minimum usable
Full Tilted
+ 15 secs./in., -Y 1.5 sec./in.
+3 7 secs./in.
B. Maximum usable
Full Tilted
+Y 1.8 sec./in., -Y_ 1.5 sec./in.
+) .8 sec./in.
+Ya 14 secs./in.
+ 7 secs./in.
Not Tilted
+Y 1.7 sec./in.
.8 sec./in.
The carriage rate control requires almost constant adjustment when scanning
imagery because the X motion runs at about double the speed of the Y
motion.
MISCELLANEOUS CHANGES (See accompanying photographs)
The table elevation and tilt control box has been relocated.
'The two mechanical shade controls have been removed.
The location of the film drive motor controls have been switched
with that of the illumination controls. The film drive speed controls
have been replaced by larger round knobs.
The right inboard roller hinge has been redesigned so that the load-
ing port can be manually opened.
2. On 9 June 1970 we were joined at I land
1of IEG, andi of DIAAP-9. These individuals
examined the equipment from an operational standpoint. The equipment
modifications were found to be generally acceptable. However, it was
felt that the two "Gross" focusing knobs should be made more massive.
In addition it was felt that the X carriage motion needed the same type
of electrical locking action presently used on the Y motion fail safe,
whenever the carriage drive motors are de-energized.
3. Discussions were held with 0 representatives in order to
determine which additional specific fixes and modifications would
be incorporated into the,production model of the light table.
F
representatives comments were as follows.
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FILM HANDLI.TIG
Plan to use a "T" bar arrangement with the brackets so that drive
motors will slide more easily.
The exposed electrical motor wires will be redressed and tied down
to the table. The quick releases for film spool bracket will be relo-
cated downward approximately 450 from the horizontal and will utilize
a straight lever arrangement (a previously used configuration).
Emergency film hand cranks will be provided. Rollers will be placed
on the light box cover so that the cover can be used for split-v?
viewing.
MICROSTEREOSCOPE MOUNT AND CARRIAGE
Some means will be provided, either to give an adjustable drag to
the X motion,.or to lock the carriage in X when the X motor control is
released.
The X carriage speed will be reduced to match that of the_Y carriage
when the table is operated in the horizontal position.
A pod holder of design will probably be incorporated in lieu of
the lI fine focus moue .
MISCELLANEOUS CHANGES
The sharp edges of the film drive and light control boxes will be
contoured.
A~raised 2 inch lip will be placed on the rear back edge of the tables
back panel.
Larger, easily lockable swivel casters will be used.
A film threading diagram will be displayed on the raised back panel.
Pictograms will be placed at the motor transport stations to show
correct switch positions for the different film threading configurations.
The table elevation and tilt control box will be re-relocated. It 25X1
will be moved forward slightly and mounted lengthwise.
Test Engineer
TEB/ESD
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Original - TE;SG `.C]?l3
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1 1I' 9
1 - RE1)/'TSSG
1 - Chief , ESll
NPIC/TSSG/ES])/TEI) (19 dune 70)
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 Figure 1
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.YICROSTEREOSCOPE "GROSS"
Focusing Mechanism
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1 iec CC ~3'O S .
Figure 4
Fail-safe override toggle switch.
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Figure 5
Inboard Roller - Open
Figure 6
Inboard Roller - Closed
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Figure 7
Table Elevation and Tilt Control Box.
Figure 8
Motor Drive and Illumination Control Pane[
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BEST COPY
A VAILABLE
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