INTERPRETOSCOPE

• Document Type: CREST
• Collection: NGA Records (Formerly NIMA)
• Document Number (FOIA) /ESDN (CREST): CIA-RDP78B04770A002500040013-8
• Release Decision: RIPPUB
• Original Classification: K
• Document Page Count: 10
• Document Creation Date: December 28, 2016
• Document Release Date: May 12, 2005
• Sequence Number: 13
• Content Type: REPORT

Approved For Release 2005/06/06 : CIA-RDP78B04770A002500040013-8
Oh Ae
I1S/4TJ-~rj ~~ rem
Qe4- L
Declass Review by NGA.
Approved For Release 2005/06/06 : CIA-RDP78B04770A002500040013-8
 Approved Fo0lease 2005/06/06: CIA-RDP78B047X002500040013-8
The interpretation of information derived from photographs
is today an indispensable aid in the solution of technical, econ-
ornic, nd scientmf ci p~ot~i .
Par-t-kola-r-l-y-h-igh-dema-nds-ar-&--placed on t e-readabil ty-of
,_photographs, especially of those of the sort usually taken from
aircraft. To keep pace wit1 he continual improvement in photo-
graphic materials and the employment of cameras fitted with high-
performance objectives, there is required an apparatus which offers
the possibility of studying in the laboratory the consistent spatial
re a ions ips con acne n aeri p o ograp an ere y o ding
pres-mt o-the-professim-a-no-dern-intexpretation device, distin-
guished by its high level of performance, simplicity of operation,
and sturdiness and rationality of construction. It satisfies all
the demands, and even the wishes, placed on apparatus of this type.
aeria photograph-pre-sents-to-the-viewer -a-survey-of
-.--every v-isible-detailin-the-photographed ar &-at_some-instant_in
time. The field of application of the-instrument-lies, therefmre,
in those diciplines concerned with the changes, the description,
or the study of the surface of the earth. By special interpretation
'of the picture content, which can be done exactly only under stereo-
phot_pgraphs,_although in the preparation of topographic maps, for
example, one must carry through an extensive generalization of the
detail in order to insure legibility.
Approved For Release 2005/06/06 : CIA-RDP78BO477OA002500040013-8
scopic viewing, it is possible to extract quantitatively the total
informat i conten o -tM picture-fact-interpr-otati-on-work--i-s-
plotting
l s o-awe-r-equi ,. t-f or the qugn itat-ive-ambatzx-of- aerial
 Approved Foelease 2005/06/06: CIA-RDP78BO47S 0025OOO4OO13-8
n this-way-tas
services i n foresstrr,I-LSOe ~"'rc1Yt+J-Ta..+c'~"- od agri-
culture, ae,"Jwze* commerce, and city and regional planning,
as wel as for military intelligence.
U sides interpretation tasks, the equipment also serves for
picture scanning and for preparatory wotk on pictures which are to
be plotted in cartographic operations, Picture scanning may in-
elude judging the photographic quality, checking the overlap of
adjacent pictures., the ig t path,, a-nd the recognition o mariced
-P(>nts-sn-tie-ground.die-preparat-ienof-pietures-f?r-stereo-
scopic evaluation implies the selection of the evaluation technique
to suit the character of the terrain or the choice of points to
be used in net-orientation ok triangulation,
MODES OF OPERATION
The picture material be interpreted can be on positive or
t' inroll-s--or ndividual pictures,, , glasts
Date-s.,-orpape"-There-are_ncZr_estrictiona on the-choice of
emulsion. Thus, the material best suited to the task at hand may
be used, such as panchromatic, infrared, or color.
The range of motion of the objectives and the optical rotation
of the picture are so chosen that steveoscoptc viewing of near-
vertical aerial= photographs is possible without displacing the
ictures. The-following-table-give-s-ii ormation-on the ange
of anal i cation to_standard photographic ormats-.--
,SIZE, CM.
OVERLAP
COMMON AREA
CHIP
PAIRS
ROLL
PAIRS
CHIF. ~
PAIR
ROLL
PAIR
18x18
(7")
no
50%+
inner or
outer
23x23
(9")
`
40%+
3
(12")
35-75%
35-75%
inner
inner
Approved For Release 2005/06/06 : CIA-RDP78BO477OA002500040013-8
 Approved Fo.lease 2005/06/06 : CIA-RDP78BO47W002500040013-8
The-view-ing-magnification -may be-varied be-tween-2x-amd---15xi -
the most favorable magnification. Magnification of greater than
Thus,_ the interpreter has a broad rye of chaff r~~electing
15x generally yields, because of the grain of the emulsion, no
improvement in interpretability. The 2x-15x range of magnification
two xagas_sta es.
from one stage.to the other_is-accomplished_bymeans-of-a-r-apid--
is divided into stmpxx Within these stgges, the change in magnification
is--by means of a stepless-zoom system. -The first dtage extends
--from-2x-to-6x while-the second extends from 5x to 15x. The change
change of a turret-objective. No eyepiece change-is required,_though,
so that the interpreter retains a nearly distortion-free stereo-
scopic view of the picture throughout the entire 2x to 15x range.
If the scale of the individual pictures of the pair is different,
-'-'--tom zoom -syem will compensate in magnification up to a ratio of
!lt 3; or by-using the-turret=ob7ectivez-as-wed; ug-to-1
The Interpretoscope consists of the basic units:
Light-table for supporting the picture material
which are connected to continuous side-members. The distance
-between the-t Ye alyd-the yawing op ics s been a so en ]a rge
~so_ hat_the-oper-xtor-has-easy-aecess-to-the-p-ic-tures-.
In the viewing unit the objectives and rotation prisms
~ move on cross-slides in the x- and y-directions under the control
of hand-grips. The distance between the two objectives, to which
the two pictures are aligned, is controlled by rotating a spindle
which is brought out to the left hand-grip. When changing to a
! ii far t pictur- e format, e o sec vas can a approximate]
-poslt-ioneout-ta-2-20-mm-(-g!04,-S za-t-the are-at us-tab-le-to
a maximum distance of 310 mm (12"") armed a minimum dist-ance_od_
Approved For Release 2005/06/06 : CIA-RDP78BO477OA002500040013-8
 Approved F* lease 2005/06/06 : CIA-RDP78B04*002500040013-8
OPTICS
--Tie pictures on t e Iig1it ti le are view-~ec-~rontally:
--able--objectives p-ick up the picture-and- image- it- via -rotation - -
prisms and Schmidt Drisms which acre individuallyadjustable-for--the
right and left picture onto the intermediate image plane. The
intermediate images are xizvi imaged through prisms and a zoom
optical system which allows for stepless change in magnification
onto the ocular plane. There the image is viewed through a
Woub-16 ocul Tn the ocular p an S -166-a- a black, point
-reference-mark: --The-operation- of- the- image rotation-and the -z oom-
-_systems is -carried - out- -by_means-- of knobs -on_the_-front plate of- -
the viewing unit.
The optical system is notable for its especially large
stereoscopic field of view and its high image quality. The
size of the field of view in the picture plane is given by
m mm, where m is the magnification. Thus, at 2x the field
41
s_ 0 -mm-(4
and-at-25x, 13nun-( "j . Theolserat thus
has the o> +
purtuni-tom to_ge_t-an-over-al-]r-v-iof th e--pic#.ure-a
and then, by using a higher magnification, to interpret in detail.
The resolution capability, referred to the picture plane,
depends upon the magnification as the following table indicates;
MAGNIFICATION RESOLUTION, 1/mm
2x
13
6x
1x
-4-0
100
Approved For Release 2005/06/06 : CIA-RDP78B04770A002500040013-8
 Approved Fcelease 2005/06/06 : CIA-RDP78B04*002500040013-8
In order to regulate the brightness, fluid filters are inserted
into the light path. They permit the brightness of either picture
low - eerregulated individually in both transmitted and incident light.
1'he-ee re obe-are-oar-the-frontpa ne off-the viewer uni.
proved For Release 2005/06/06 : CIA-RDP78B04770A002500040013-8
awn-strips-Tongt-he-sides-o
the plate serve to hold roll-film of any formatL oveable_and
rotateable table-clamps hold individual pieces of film. Cover-
glass plates serve to hold strongly curved material bit flat.
HOLDING DEVICE FOR ROLL-FILM
h"fd~t~embers o e appara us are removable holders
for roll-fill~n-up o_32mm-{ ?'t",~) a ? T e d of-tY a leader
is inserted into a longitudinal slit in the take-up d ibm- and-wound
up by turning a drive wheel.
ILLUMINATION
The apparatus is equipped for both transmitted- and incident-
iewing. Fluorescen amps are installed under the glass
Plat to-previd2-eve j , , --- - ? on-fortran3 parenimmure materials-,
Incident-light ilumi-n&tion ia-pr-avided_by-pr or- l ampsand
condensors. These move along with the objectives ans thus always
illuminate the portion of the picture being viewed.
lass-late 3 em x cm x. 2 to
 Approver I- eIease ZOUO/Ub/Ub : GIA-F(UF'1t$tUU4WUUZO0004UU1:i-t3
-If-the-ftsght altitudend -the-distance- hetweentaking-goints
! is- known-and _the--difference-inlwriz.ontal-parallax_is -measured, the- -- - -- -
relative object heights of neighboring points may be_calculated.
For this reason, relative motion between the two objectives is
provided for, as well as the free motion in the x- and y-directions.
The base-line of each picture is oriented along the x-axis of the
instrument by rotation of the picture in the picture-plane, while
-thay--motion-I-s-cla ped
scale to the nearest 0.02mm. The parallax difference is taken as
while observing-the reference mark is read out _on a_ micrometer
- ---The-parallax setting obtained by -turning- the---le-f-t- hand-grip - - - - -- -
the difference between two conjugate readings. The parallax in the
y-direction is eliminated by turning the right hand-grip.
AUCESSDRIES-
der-te-measure ---lAstanees-onthe-photagraph; -a-glass-wale
isxpzxidet_2 ") long is provided, whose -smallest diYision
on the first 10mm measures 0.1mm. The scale is placed on the
photograph and examined through the Interpeetoscope. Besides the
take-up drums for roll-film, film spools may also be fitted into
the holders. Adapters are furnished for 20 and 2L. cm spools. The
adapter tog ther with the oop rep ac the drum. -apooI cm
!~-f ?1m-maybe-inserted-directly.
For_.f-lat-teni.ng-str-o gly curyesl_materiat, 30x3D-cm_glass--plates
~i are provided.
Approved For Release 2005/06/06 : CIA-RDP78BO477OA002500040013-8
 Approved Foor lease 2005/06/06: CIA-RDP78BO470002500040013-8
Magnification:_ 2x-6x and-5x.7-15
1; Magnification compensation between right and left picture:
with zoom and turret: up to 1 :7.5
rieia or stereoscopic view: euumm/magniricara.on
i
- -Diopter -a djeutmei t - ---
-IPD-Adjustment: - 55---75- mm-- - -
i
Illwr-dnated_surface:_ Incident light - adjustabike to 110 mm (4/") dia
Transmitted light - 600 x 300 mm (24x12")
Optical image rotation;. 360 deg
Common displacement of objectives: (Free-hand motion) x-axis max 240 mm (9/")
y-axis max 300 mm (12")
Parallel-axis motion of objectives: x-axis 90 - 310 mm 1 3 - 12'')
y=axis-+ 65 mm(-2"-)
Dimensions: Width without film-holder: 1000 mm (391 ")
Width with film-holder: 1260 mm (50")
Depth: 700 mm (27/")
Height: 5 }')
Weigh mn-276- kg-( 0 1b )
Approved For Release 2005/06/06 : CIA-RDP78BO477OA002500040013-8
with zoom: up to 1 : 3
 incident and transmitted light.
-8-
'Apparatus for interpretation of aerial photographs. Stereoscopic
picture viewing with continuous change of magnification from 2x
to -6x and -from--5x- to i5x--Viewing-of--cut-and-uncut-material-up
_- _to_3G-x_30_cm_(l2xl2'q-format -with. 75%-overlap- possible-in--both-
Approved F* lease 2005/06/06 : CIA-RDP78BO470002500040013-8
;Shipment includes:
Nomenclature
Interpretoscope for 190 mm, 200 mm,
2140 mm and 320 mm film widths
Order number
14-0-040
1 ea. Ground glass plate
145108:051-00
lea. Fluorescent lamps 20/59
TGL 8624
-
17a B
5
824 0 54- Gl7.14
7 ea. Starter, St 3 for lamps
TGL 70-113
28
055290-0-31-
.
TGL 11229
1 ea Power cord
145108:065.10
8 ea Table clamps for single pictures
115108:002.11
1 ea iewin
with
F fi
ht-f41-t-
rs
2
58-3566B
g
e
-ea.-
1 ea. Transformer
058011:002-.53
2 ea. Projector lamps T F1/6V 30W
TGL 10619
1 ea. Glass measuring scale 200mm
147520
1 ea. Case for glass measuring scale
`
149705
it
ar on muses for inc lig
illuminator
145108:217.10
Approved For Release 2005/06/06 : CIA-RDP78BO477OA002500040013-8
 Approved Fcelease 2005/06/06: CIA-RDP78B04*002500040013-8
_NOMENCLATURE- -
2 pr Adaptors for film spool 19-2Q/120
2 ea Holder for roll-film to 32 cm width
2 ea Drums, take-up for roll-film to 32 cm
- 2- ea Cover=glass - plat"- -30-)C-39- din
2 ea Hold-down strips for roll-film
1 ea Stool, black
1 ea Dust-cover
-1-ea-Packing=case
On Special Order
_2 _ea Film gipools 19-20%20
2 ea Film spools 24/120
2 pr Adaptors for film-,spool 24/120
2- ea. Film spools 32/120
- MP NUAL
----. lea-Instructions
1 ea Plan and wiring diagram
- --ORDER--NUMBER-
-- __liG 7.3$aOa3 7-..11_
145108:002.14
145108:082.10
1 5108:101.00
145108:001.11
042401 B
029510:079.24
029522:571...24
11.002.-2 , -
142651 A
147350_ U38
142652 A
14-G-352-1- -
Approved For Release 2005/06/06 : CIA-RDP78BO477OA002500040013-8