GENTLEMEN:

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04747A002900010002-8
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 9
• Document Creation Date: December 28, 2016
• Document Release Date: November 15, 2001
• Sequence Number: 2
• Publication Date: September 3, 1964
• Content Type: LETTER

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25X1A
25X1A
September 3, 1964
25X1A
DECLASS REVIEW by
NIMA/DOD
Reference: February 5, 1964 Letter
25X1A Subject:
Gentlemen: 25X1A
Since the referenced letter, technical personnel with
guidance from your technical representative have performed another
thorough review of the Panoramic Stereoviewer. The result of this
review and the proposed tasks to complete the program are discussed
in enclosure "A" to this letter.
The problem of successfully grindin g and polishing glass drums for
the instrument has been solved. on Company funds, 25X1A
was able to obtain a subcontractor who has successfully completed
four drums. They remain to be assembled to the instrument.
The cost status of the contract is detailed in enclosure "B" to
this letter. Accumulated expenditures are adjusted to actual
25X1A rate for 1962 and 1963 as well as the provisional rates for 1964.
Please refer to letter of 9/l/64 regarding these
25X1 rates for
Estimated total contract cost
Allocated contract funds
Total new contract price
25X1A
It is estimated that the Panoramic Stereoviewer can be completed
within 120 days after your approval of this request for additional
funds and approval of the subcontractor. The manual of operation
and maintenance and residual inventory list will be completed 30
days thereafter.
If you require additional information to complete your evaluation
25X1A contact me at Group I
25X1A
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 ENCLOSURE "A"
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DESCRIPTION OF PROPOSED MODIFICATIONS TO ThE PANORAMIC STEREOVIEW1
GENERAL
The modification proposed for the Panoramic Stereoviewer is for the
purpose of improving the operational performance and reliability
of the instrument, In addition, the modification will permit a
large reduction in the required tension on the film. Tests conducted
on the present instrument indicate that the tension should be reduced
to protect the film from damage. The combination of film tension
and the inherent eccentricities in the core axis and flanges of
film spools causes chafing of the edges of the film which results
in scalloping and tearing of the edges of the film.
On the present instrument the film tension is maintained high
assure adequate friction between the film and the plexiglass drum
surface for the film to drive the drum when in motor drive and for
the drums to drive the film when in manual drive.. In addition to
a high film tension it was found necessary to add elastic friction
bands to the plexiglass drums to maintain a sufficient coefficient
of friction between the drum and the film.
The proposed modification will eliminate the need for bands on the
drum surface to increase friction and it is estimated that the film
tension -will be reduced to approximately one-half the present
tension. The motor drives and controllers now on the instrument
will be used fully and the manual control handwheels on the center
solumn will be retained. The drive modification will be primarily
in the mechanical linkage from the handwheels to the drums and the
addition of friction and idler rollers in the film loop over the
drum.
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 Approved For$elease 2002/01/10 : CIA-RDP78B0474;A002900010002-8
n addition to the modification in the film drive, glass drums will
replace the plexiglass drums on the instrument. The glass drums
will be less subject to abrasion and will be of a superior optical
quality. Reticles will be installed in the optical viewing system
to serve as a reference for the X and Y eounte:?a,. A head rest will
be added to assist the operator in holding his head in the proper
orientation for viewing. Blue diffusers will be added to the optical
condensing system to eliminate the yellow color in the illuminated
format when the tungsten lamps are operated at a low color temperature.
The present rings on the rotation prisms will be replaced with rings
engraved to indicate the angular orientation of the prisms. Also
there will be several minor modifications to improve the operating
performance, stability and appearance of the instrument such as:
resurfacing mirrors in the condensing, systems, covering the table
surface with vinyl, refining the electrical balance of the drive
system, strengthen the door frames on the cabinet, strengthening
the mechanical coupling in the drive system and adding; identification
and instruction plates.
DRIVE, MODIFICATION
The drive modification will be essentially a mechanical modification.
Ass illustrated in Figure =#l, a pair of rubber coated friction rollers
and two idler rollers will be added to the film loop.over the glass
drum stages. One of the friction rollers will be in contact with
the drum and with the second friction roller--'. The second friction
roller will make contact with the film. The idler rollers will be
positioned on either side of the friction rollers to maintain the
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 Approved FQelease 2002/01/10: CIA-RDP78B047% A002900010002-8
PANORAMIC VIE: W ER
FILM _ . c lVE`
.FRtCT'IOt _ ROLLERS
!IG U.RF-
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 Approved For Fglease 2002/01/10 : CIA-RDP78BO47474002900010002-8
and second friction roller. All rollers will rotate with a minimum
of frictional drag on roller bearing supported shafts.
In "X" motor drive the film is tensioned over the drum and the
upper (second) friction roller. It is driven by torque motors which
are gear connected to the film spools - the same system as on the
present instrument except for the addition of the friction rollers.
The coefficient of friction between the upper friction roller and
the film, drives the roller at the same surface velocity as the
film. The roller in turn drives the other friction roller and drum
at the same surface velocity as the film. Though the film in
contact with the drum will assist in driving the drum as on the
present system, the prime driving force for the drums will be the
friction rollers.
To drive the film manually in "X" the present handwheels on the
center column will be used. However, instead of driving the drum
through a flexible drive to a large gear on the drum, the flexible
drive will be gear connected to the upper friction roller which
engages the film. The friction roller will in turn drive the film
and the surface of the drum simultaneously at the same speed. The
drive will be engaged by a magnetic clutch which will automatically
disengage when driving the film in the motor mode. Tensioning the
film will be through torque motors In both the manual and motor
modes, as on the oreeent instrument,
To couple the "X" manual or motor drives the existing telescoping
drive shaft will be utilized after modification to strengthen it.
However, the drive shaft will be gear connected to the friction
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 Approved For Release 2002/01/10 : CIA-RDP78B04747A002900010002-8
rollers which engages the film instead of the drums on the present
instrument. k magnetic clutch to engage the "X" couple drive will
be activated by the switch presently on the center column of the
instrument. The "X" couple will assure a positive interlock
between the two sides of the instrument and will permit the operator
to drive the film with either (or both) joysticks without loss of
the relative orientation between films on the two sides.
The maximum slew speed in the uncoupled motor drive will be
approximately 200 feet per minute. In the coupled motor drive
the maximum slew speed will be reduced approximately 50 percent
when driving both sides of the instrument with one pair of torque
motors. The operator may increase the coupled speed by energizing
both joysticks in the coupled mode. The two sides will be compelled
to drive at the same speed due to the mechanical. couple.
A breadboard of the friction and idler roller part of the drive
modification proposed has been made and installed in the instru-
ment. The tests conducted with this breadboard give every indication
that this modification will be a significant improvement in the
operation of the instrument and permit a large reduction in the
present required tension.
There are no proposed or anticipated modifications being considered
in the CRY" manual or motor drive. It is believed that it is satis-
factory as it now stands.
GLASS DRUMS
pour glass drums have been obtained for the viewer. It is proposed
o the instrument with two
to rep BVeA6ortRele X10 delta-I DP%ffi4 A002900010002-8
 Approved For Release 2002/01/10 : CIA-RDP78B0474?A002900010002-8
glass drums and furnish the other two as spares. The glass drums
are dimensional more accurate, are of a better optical quality and
are considerably more resistant to abrasion than the plastic drums
now on the instrument.
The glass drums will require now mounts because of the differences
in dimensions of the drum and the expansion characteristics of the
glass.
RgTICLES IN TliE OPTICAL SYST94
On the present instrument there is no reference in the viewing
system for coordinating imaging with the "X" and "Y" counters other
than estimating the center of the field of view. It is proposed
to mount dissimilar reticles, a circle and an open cross, in the
two sides of the optical system for references. Unlike reticles
are proposed to avoid the operator=e tendency to try to fuse the
reticles when viewing the film in stereo and also for easy
identification of the reticle associated with the particular pair
of counters being read.
The reticles would be positioned in the intermediate image plane
on the objective side of the soma system, This location is
recommended to avoid lateral displacement of the reticle when
sooming. The magnification change of the reticle would be the same
as in the Zoom Macroscope (3 to 1) which it is believed would not
be objectionable to the operator.
HzAD REST
Operation of the instrument has shown the need for a head rest.
the eta 4e*d i1 ?O a b1 GVI~I~OP4~} I 002 ,in 00II2 8terec~-
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viewer has been installed on the instrument, however, some
modification of the head rest is desirable because of the difference
in the operator's viewing position.
DIFFUSERS FOR THE CONDENSING SYST 4
When operating the instrument at lower magnification the lamps for
uminating the format must be used at a low voltage. This results
in the lamps operating at a low color temperature and introduces a
noticeable amount of yellow into the projected format. Also there
a glare due to a hot spot in the center of the field at low
magnification. A blue ground glass diffuser experimentally positioned
below the anamorphic condenser eliminated the hot spot and filters
out the objectionable yellow portion of the spectrum. It is
proposed to permanently mount diffusers to the anaxaorphic condenser
mounts.
PRISM ROTATION RINGS
The prism rotation rings for image rotation are engraved to indicate
the normal non-rotated orientation and the 90 degree rotated
positions. It is proposed to replace rings with ones similar to
those on the High Power Stereoviewer which indicate the image
rotation in degrees for every 15 degrees.
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 25X1A Approved For Release 2002/01/10 : CIA-RDP78BO4747AO02900010002-8
Approved For Release 2002/01/10 : CIA-RDP78BO4747AO02900010002-8