BRIEFING PRINT ENLARGER

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A000500010005-2
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 28, 2016
• Document Release Date: October 8, 2004
• Sequence Number: 5
• Publication Date: January 22, 1965
• Content Type: PERRPT

Approved For Fse 2004/11/30: CIA-RDP78B047700500010005 2
SECRET
MONTHLY REPORT
PAR 202
22 Jan 65
SUBJECT: Briefing Print Enlarger
TASK/PROBLEM
1. To design and build a prototype enlarger for exposing high-quality
briefing prints in formats up to and including 20 x 24 inches in size. Mag-
nification to be in the 10 - 60 diameter range. The enlarger will be able
to produce both black-and-white and color prints. Changing from one capa-
bility to the other should be made with a minimum of effort.
DISCUSSION
2. Our effort in this period was to continue design and fabrication
of a breadboard system which will provide engineering data for this project
and also for PAR 224. The accomplishments during the period have been:
a. Vacuum Platen Carriage: Rough castings for the platen and
carriage of the breadboard have been received. Parts are being fabricated
for the platen drive and position indicator.
b. Main Frame: Design and detail drawings for the lower frame
and optical frame of the breadboard are complete. Quotations have been re-
quested for fabrication outside the contractor's shops.
c. Lamphouse: The breadboard lamphouse design is approximately
70 percent complete. Detail drawings have not been made. In order to
facilitate changing the condenser lens, to be compatible with the objective
lens being used, the lamphouse is being designed so that interchange of
assemblies, containing the condenser lens assembly, the lamp and the light-
tight enclosure, can be readily accomplished.
d. Objective Focus Assemblies: These assemblies are being de-
signed to focus the lens with a "tensioned-thread" system as used in the
10-20-40X Precision Enlarger. Lens focus position-is indicated by a four-
dial digital counter. Coupling of the counterto the focus motion is matched
to the focal sensitivity of each lens such that the "depth-of-focus" is
NGA Review Complete
GROUP 1
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 Approved ForSease 2004/11/30.: CIA-RDP78B0477 00500010005-2
SECRET W
PAR 202
22 Jan 65
represented by two to five counts. Lens assemblies including mechanism and
platen plates will be interchangeable. The design of these assemblies is
about 70 percent complete. No detail drawings have been made.
e. Objective Lenses: The lens designers have confirmed that com-
bination designs for color and black-and-white are possible for all of the
required lenses except the 40X to 60X lens for the Briefing Print Enlarger,
PAR 202. Formula sheets (optical designs) have been released for mount de-
sign and sample fabrication for all but one of the required seven (7) lenses
in PAR 202 and PAR 224.
f. Negative Transport Model: Assembly of the X-Y coordinate in-
dicators upon the negative transport breadboard model is progressing.
g. Lens Focus Setting and Magnification Table: The computer pro-
gram to calculate the values for the Focus/Magnification Table has been re-
written to make use of E.F. and front-focal-point to rear-focal-point separ-
ation from visual lens bench measurements in addition to the photographic focus
calibration measurements on the enlarger. This program was run successfully
with hypothetical data and sample tables were generated for use by the designers.
No further work with the program is planned until the breadboard enlarger and
sample lenses are available to provide actual calibration data.
PLANNED ACTIVITY
3. Effort in the next period will be to:
a. Continue breadboard design and detail drawing effort and re-
lease completed component and assembly drawings for fabrication.
b. Begin breadboard electrical control circuit design.
c. Make the final release for sample fabrication of the objective
GROUP 1
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ing and declassification