COMMENTS ON(Sanitized)PROPOSAL NO.635 FOR ADVANCED LIGHT TABLE FOR (Sanitized) VERSATILE STEREOSCOPE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000300010006-3
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 17
• Document Creation Date: December 28, 2016
• Document Release Date: July 2, 2004
• Sequence Number: 6
• Publication Date: April 27, 1965
• Content Type: MF

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PID/OSS - 58/65
27 April 1965
MP2IORMDtJ!4 FOR: Assistant for Plans & Development
ATTENTION : Chief, Development Branch
FROM : Chief, Photographic Intelligence Division, CIA
SUBJECT : Comments
proposal No. 635
for advanc agar, e for
Versatile Stereoscope
1. As requested by 0 of your Staff, the Operations
Support Staff, PID has reviewed the proposal submitted by the
for an advanced light table and mount
x : erase Interchangeable Rhomboid Stereoscope. The
.Lor Photographic Intelligence Division is extremely interested in
achieving the most useable mount for this microscope since this
instrument promises to be one of the most versatile tools available
to the P.I. in the near future. We currently have eight of these
stereoscopes on order and believe that their efieetive utilization
requires a specially designed mount and light source.
2. The various proposals submitted by the bidders on this
contract have been discussed in detail with PID concurs
with his belief that the proposal represents the best
solution to the problem. particular we feel that the high intensity
tracking light sources, the spool loading and holding mechanism, and
the film transport drive system represent sound and. imaginative solutions
to the requirements set forth in the design specifications. PID would
like to express a preference for the servo electric power amplifier
option offered by since it is felt that this would be an
important factor operator comfort and acceptance of the instrument.
3. The Operations Support Staff, PIT? will be available at any
time for discussions on this instrument, and will follow it *.rith
close interest through the development stage.
Distribution:
Orig.
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NATIONAL PHOTOGRAPHIC
INTERPRETATION CENTER
TECHNICAL
PUBLICATION
SUPPLEMENTARY
TEST AND EVALUATION REPORT
ADVANCED 918 LIGHT TABLE
25X1
CONFIDENTIAL
NPIC-56/70
OCTOBER 1970
GROUP I EXCLUDED FROM
AUTOMATIC DOWNGRADING
AND DECLASSIFICATION
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This document contains information az'-eting
the national defense of the United -,rates,
within the meaning of Title l3, S~ etions
793 and 794, of the U.S. Code, as at. nded.
Its transmission or revelation of its c ntents
to or receipt by an unauthorized per on is
prohibited by law.
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SUPPLEMENTARY
TEST AND EVALUATION REPORT
ADVANCED 918 LIGHT TABLE
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T & E Report No. 69-04
Supplement
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Test and Evaluation Branch
Engineering Support Division
Technical Services Group
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ABSTRACT
1. SUMMARY
TEST DETAILS
DISTRIBUTION LIST
FIGURE 1. Advanced 918 Light Table Modified
Prototype
2. Rear View - All Handwheels with Handles
Removed
Page
1
3. Electronic Compartment. Original Manual
Chain Drive Mechanism Removed 7
4. Disassembled Motor. White Silicone Rubber
Placed on Brush Springs to Eliminate Noise. 8
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FIGURE 1. Advanced 918 Light Table Mod Pied Prototype
iv
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The Advanced 918 Light Table prototype was
tested and evaluated and then returned to the contractor for rework.
Test and Evaluation Report NPIC/R-05/70 presented the results of the
first evaluation.
This report supplements the earlier report (NPIC/R-05/70) and
describes changes made in the prototype. An evaluation made by opera-
tional components is included. After all tests and evaluations were
made the prototype light table was transferred to an operational compo-
nent for routine use. Further procurement of 918 Light Tables is not
planned.
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The dvanced 918 Light Tab e is a bench supported
viewing light table used for photointerpretation. It accommodates single
spools of 70mm, 5, 6.6, or 92 inch wide film wit its 9 by 18 inch viewing
surface either horizontal or tilted. In April 1 69 the engineering proto-
type table was received by the Center and subsequently tested and evaluated.
Test and Evaluation Report NPIC/R-05/70 of :Larch 1970 gives a detailed
description of the equipment, design requirement, test results, observa-
tions, and test procedures used at the time of t`.e first evaluation.
The contractor did not meet several design ?equirements and the table
was returned for modifications. At that time, t_e Center reviewed and
revised the original specifications and presentei to the contractor a
list of items requiring modification or repair.
The viewing light table was reworked accorc.-ng to the revised speci-
fications and passed acceptance tests in Septemt r 1969. The equipment
subsequently received an operational suitability evaluation by one of
the Center's operational components.
This report supplements the earlier report NPIC/R-05/70). Statements
of required changes as given to the contractor ,:re cited and changes made
in the accepted prototype model are described. ?perational suitability
test results are also included.
The reworked 918 Light Table Prototype was ound to satisfy all
requirements of the revised specifications.
Due to the versatility of a newly developed model 1540 Light Table
no procurement of 918 tables is planned at this time, but the prototype
has been accepted by the NPIC operational compor nt for routine use.
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2.1 Acceptance and Performance Tests
Manual Drive System
Revised Specification - "The bidirectional manual drive system,
consisting of handwheels, chain drives, electric clutches, slip clutch,
cbi_rection switching microswitches, etc., must be removed as well as the
manual tension controls. Openings left in the shell must be covered."
".Handwheels must be added to the outboard ends of the motor shafts.
These handwheels are to be without handles and should be designed as
shown on the accompanying drawing." (Drawing supplied was for a knurled
cdre, 3L to 4 inch handwheel.)
Changes Made By Contractor - The manual film drive mechanism of the
coriT)Jnal design has been removed. It consisted of three handcranks all
connected by chain through a series of sprockets, idlers and shafts.
Before removal this produced excessive tension, and manual transport was
r-c5ucr,h and extremely difficult. The Light Table now has three and three-
quarter inch diameter knurled edge handwheels on the outboard ends of
the motor shafts. See Figures 1-3. These wheels turn during power trans-
port. Since the motor drive will move film fast or slow across the
viewing stage the handwheels are needed only for transporting film short
cistances or for rewinding film in case of electric power failure.
.1.2 Film Spool Brackets
Revised Specification - "A detent must be added to the movable
bracket support bar which contains the other detents for locking the
.racket in various positions. The added detent will allow the movable
bracket to be locked all the way open."
"A rubber bumper should be added to the movable bracket support
bar on each side to reduce the shock caused by the inadvertant release
of the movable bracket."
Changes Made By Contractor - An additional locking position has been
added to the film spool bracket support rods. This allows 92 inch film
spoo is to be placed in position without manually holding open the spring
loaded brackets. In addition, a rubber bumper was added to each rod to
reduce the shock caused by an inadvertant release of the brackets.
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2.1.3 Illumination
Revised Specification - "The illumination s stem must provide a
maximum illumination of at least 2,000 ft. lamberts within a 2 inch
radius of the geometric center of the illuminate area. The maximum
linear brightness gradient must not exceed 1501 b.-tween any two measurements
taken within the shaded area shown on the diagrar below, nor 25% anywhere
within the illuminated area." (Diagram showed a shaded area covering
the entire format except for a one inch wide bane around the format
perimeter.)
Changes Made By Contractor - The system pro ides maximum illumina-
tion of 2,200 ft. lamberts within the central ar, a with a minimum of
1,811-0 ft. lamberts anywhere on the viewing surfar This gives a maxi-
mum brightness gradient of 16% over the surface. Illumination is some-
what blotchy in appearance.
2.1 .4 Motor Noise
To Be Modified Or Repaired - "The cause for the squeal in the left
motor and the cause for the knocking in the left movable bracket assembly
must be eliminated."
Changes Made By Contractor - The original t,sts conducted on the
prototype table revealed a high frequency squeal when the left motor was
rotated counterclockwise. This noise, in the rage of 5 to 7 KH, was
very disturbing to operators and nearby personne.... When the reworked
model was delivered this condition had not been -liminated so the con-
tractor was notified that the table was not acceptable. In September
1969 a representative from visi ed NPIC to correct this
situation. It was found that the squea was due to a high frequency
vibration in the motor brush springs. By coatin these springs with a
silicone rubber material the noise was eliminate . Two of the coated
flat springs appear inside the narrow plastic r in the center of Figure
4.
2.1.5 Electrical Leakage
To Be Modified Or Repaired - "The source of the electrical leakage
(causing the 5 volt potential between the table and ground) must be
found and proper insulation added to prevent lea'-ape."
Change Made By Contractor - The contractor idd not eliminate the
electrical leakage considered by the contractor "o be caused by induced
transformer voltage. This was measured as apprp.imately 0.5 milliamperes.
Since this is below the 2.5 milliamperes limit s ated in the 0 Human
Engineering Design Guide the condition is consid-red acceptable.
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?.1.6 Erratic Film Transport
Whenever the tilt motor is operated, film will transport several
inches even though the film transport switch is off. This condition
was not noticed during the first test period and possibly was created by
the contractor's modifications to the light table. The contractor stated
that the condition most likely was due to induced voltage. This condition
was not fixed.
2.2 Operational Evaluation
Subjective comments received from photointerpreters who operated
the table indicate a favorable impression of the Advanced 918 Light Table
over the 918 tables presently in use. The spring tensioned film spool
holder was highlighted as a very desirable feature and the knurled
handwheel for manual precise positioning of film was favorably received.
In addition, it was reported that the motorized film transport is
somewhat jerky and imprecise at slow speeds and a flicker in the light
source is evident at all except the higher intensities.
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FIGURE 3. Electronic Compartment.
Original Manual Chain Drive Mechanism Removed
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FI(UJRE 4. Disassembled Mot( r.
White Silicone Rubber Placed on Brush SpringE to Eliminate Noise
B
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Activity
No. Copies
NPIC/PSG/RRD/DB
3
NPIC/TSG/PPS (through Ch/TSG)
1
NPIC/TSG/RED/Ch NPIC/TSG/RED/Project Officer
l`
NPIC/IEG/OD
1
DDI/IAS/Tech. Adv.
1
DIA/DIAAP-9/Tech & Dev Br.
ARMY/SPAD/PSO
ERRAND (through NPIC member)
8
NPIC/TSG/ESD
10
NPIC/PSG/Library
2
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TO CO R1
1. r1 Z
^ ALLOTMENT SYMBOL
^ APPROVAL
^ AS REQUESTED
^ CONCURRENCE
^ CORRECTION
^ FILING
^ FULL REPORT
^ ANSWER OR ACKNOWL-
EDGE ON OR BEFORE _
PREPARE REPLY FOR
^ THE SIGNATURE OF
lss
^ HANDLE DIRECT
^ IMMEDIATE ACTION
^ INITIALS
^ NECESSARY ACTION
^ NOTE AND RETURN
^ PER OUR CONVERSATION
^ PER TELEPHONE CONVERSATION
^ READ AND DESTROY
^ RECOMMENDATION
^ SEE ME
^ SIGNATURE
^ YOUR COMMENT
^ YOUR INFORMATION
0 ~.v Gvc~
GPO : 1962 0-695346
GSA FORM 14
FEB 62
25X1
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