ADANCED FILM VIEWING LIGHT TABLES WITH TRANSLATING MICROSCOPE CARRIAGE AND HIGH INTENSITY TRACKING LIGHT SOURCES

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A003000040025-8
• Release Decision: RIPPUB
• Original Classification: C
• Document Page Count: 3
• Document Creation Date: December 28, 2016
• Document Release Date: January 21, 2003
• Sequence Number: 25
• Publication Date: November 28, 1966
• Content Type: MF

Approved For Release 2003/01/28 : CIA-RDP78BO4747AO03000040025-8
CONFIDENTIAL
Snt for Photooruphic :_;n,;al ?sis, NPIC
! ar etFibVeJin:Li htTablcs tTz azl t
i;
Microscope Carriage 4nd t h Intensity Tx..ek t ng
Light Sources
1. In the latter part of 1963 v .rious individut1s of a
ion were given the opportunity to make suggestions for Line >prove
i+ent of an 9 x {C) Advanced Film Viewing Light T ible.
2. :s x result of these discussions, the attached Development
g Microscope Carriage and High Intensity Tracking Light Sources"
ted 27 1,t rch 196k were formulated. This document was submitted to
industry and, after u competitive evaluation of the resultin : proposals,
wa.s o de, it was decided to initiate a parallel effort for this c eevelo:--
oentr. From the start it was recognized that of the two contractors
:reietcted g~j.d the higher probability of success, ncv~er-
theless, uecctuase ui d e imt ortance of this effort was
Selected as an ilternaate or `back-up" supplier.
J. ,fter two and a half years of intense monitoring by thia
office :;nd extensive inputs from your organization, one of the light
t,.able 3 has been delivered and the other Is due shortly. All -o ' t?he
requ.:.rements of the De'-elop Sent Objectives have been more or less
aati. fled; but, as a consequence, the li 'a t, tables have beccz
relatively complicated in comparison to existing equipment. These
units can therefore serve as a "test bed" to determine if all -ear
of the advanced features should be incorporated into a production
version of an advanced light table; e.g., the better features of eac
light table can be combined into a single production version and the
de;s cable features el .r., i.natecl thereby reducing both e apl ity and
coat..
though most of the tdv-a ed features are direct and
ft-forward solutions, some deserve discussion.
Declass Review by NIMA / DoD
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CROUP !
Exdoded from aatomafi;,
downgrading and
declassiticafler
 Approved For Release 2003/01/28 : CIA-RDP78.B04747A003000040025-8
CONFIDENTIAL
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The masking shades are easily operated; however,
the center shade is probably better implemented in
the version. These shades eliminate the
stray ght r;
the edges of the film format.
The simple push-button film reel holders seem to
be an improvement.
The film holddown techniques has been devised which
eliminates the curling of the film by applying a
small uniform tension to the film.
The tracking light source employed in thel
Light Table has the problem of creating a.sma..
shadow around the hi& intensity spot. While this
will not effect the microscope viewing mode tie
ohta o een when the spot is being positioned.
The arch was to use a small high
intensity cold cathode light grid. The difference
in approach will allow the photo interpreter to
select which solution beat satisfies his problem.
Light Table
The excessive friction in this manual film transport
shcMs that some method of power assist is m :ndatory.
As in the Light Table, all combina-
tions of film transport functions can be acecmpl.ished.
2. The film reel brackets are positioned simultaneously
which eliminates film tracking problems. The
masking shades could be attached to this mechanism
so that the shades would automatically be positioned
when the reel brackets are positioned.
The ~ight Table
1. The film transport system can be operated in three
modes (manual, power assisted or fully powered)
and allow the operator to control the film from a
single handwheel in a ntaber of different transport
modes. Any combination of film motions can be
accomplished with this transport system. The
three separate mode feature was incorporated to
determine which method is preferred. It is felt
that the sensitivity of any mode can be improved
when the other two are eliminated.
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The implemention of the microscope move nt appear r.
to be very satisfactory on this light table. The
,excessive friction in thel movement
ias been reduced considerably, thereby permitting
uniform motion for scanning, but retaini.z the
required measurirsg accuracy.
)L.
The IIli?;ht source has a very large dimming, range
oo mpletely without fli er.
These instruments will be sent to you shortly ?'or evaluation
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Constructive criticism is sincerely seruested on all
of the two light-taWO&-KrOM the standpoint of the.
desirability of comb n rz of the t tte eatures into a single
advanced li it table ri to production. C ,ents should be
directed t
Distribution,
Qrig & 1 - Addressee
3 - TDS/DS
25X1 NPIC/TDS/DS
(29 Nov. 1966)
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