MODIFICATION OF THE MODEL 621 (Sanitized) COMPARATOR

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A000900080004-1
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: April 20, 2001
• Sequence Number: 4
• Publication Date: October 5, 1964
• Content Type: MF

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Approved For Release 20011094W : CIA-RDP rA00090008000 ..
TID-195/6+
5 October 196+
MEMORANDUM FOR: Assistant for Plans and Development, NPIC
SUBJECT: Modification of the Model 621 -Comparator
1. The Model 621 Comparator was acquired by the Technical
Intelligence Division a num er of years ago. Subsequently, the state 25X1A
of the art and the quality of the current photography necessitates
modification of this instrument. The primary need is to increase the
magnification of the viewing system comparable to that of the 880
Comparator. In addition, the light source must be altered to be
compatible to the increase in magnification. 25X1A
2. The feasibility of these modifications has been discussed with
members of your Staff and representatives of the
It is agreed that these can be readily accomplished.
3. At the time that these modifications are made it is advisable
to have the instrument inspected by technicians of the an2.5X1A
refurbished as found necessary. On two occasions the ins rumen as
been exposed to conditions inducing rusting which are suspected to have
caused certain damage and reduced the accuracy of the instrument.
3. It is requested that action be expedited to accomplish this
modification as quickly as possible. It is TIDis intent to improve the
capability of the 621 _ Comparator to support PI mensuration require-
ments during the interim period that new, more advanced stereocomparators
are being developed. Thus, it is important that this modification be
accomplished soon utilizing currently available items rather than engage
in any research and development effort.
Declass Review by NIMA / DoD
Deputy Chief,
Technical Intelligence Division
Distribution:
Orig. & 1 - Addressee
2 - NPIC/TID
1 - TID/TAB
Approved For Release 2001/05/11: CIA ,$ 04747A000900080004-
GNP1Excluded from aatomatte
dewagrading and
_declassf 1catiaa
 NPIC LUTING SLIP
Approved For Release 2001/05/11: CIA- A000900080004-1
FROM: DC/TID
ASST FOR PA
DATE: 5 Oct 64
i/DIA/NPIC
CH/SPAD
Approved For Release 2001/05/11: CIA-RDP78BO4747A000900080004-1