TWO DIMENSIONAL FOURIER SYNTHESIS ANALOG COMPUTER AT THE ACADEMY INSTITUTE FOR MEDICINE AND BIOLOGY, BERLIN-BUCH

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP80-00810A004700620001-4
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 3
• Document Creation Date: December 20, 2016
• Document Release Date: August 30, 2007
• Sequence Number: 1
• Publication Date: September 2, 1954
• Content Type: REPORT

Approved For Release 2007/08/30: CIA-RDP80-00810A004700620001-4
CLASSIFICATION SECRET
CENTRAL INTELLIGENCE AGENCY REPORI1
INFORMATION REPORT CD NO.
COUNTRY East Germany DATE DISTR.
SUBJECT Two Dimensional Fotrier Synthesis Analog Computer NO. OF PAGES
IN-A4 ine and Biology.
M
ACQUIRED
DATE OF
e
at the Adademy Institute far
Berlin-Buch NO. OF ENCLS.
(LISTED BELOW)
THIS DOCUMENT CONTAINS IMcORMATION AFFECTING THE NATIONAL DEFENSE
OF THE UNITED STATES, WITHIN THE MEANING OF TITLE IS, SECTIONS 793
AND 794. OF THE U. S. CODE. AS AMENDED. ITS TRANSMISSION OR REVEL-
ATION OF ITS CONTENTS TO OR RECEIPT BY AN UNAUTHORIZED PERSON
IS PROHIBITED BY LAW THE REPRODUCTION OF THIS FORM IS PROHIBITED.
SUPPLEMENT TO
REPORT NO.
THIS IS UNEVALUATED INFORMATION
-1. After the one-dimensional-sample of an-analog computing machinelfor-the
solution of Fourier syntheses was completed in(thd: Working Group for
Crystal Structure Analysis in the Academy Institute for Medicine and
Biology in Berlin-Buch, preparatory work on the two-dimensional version was
started. The following is the text of a directive concerning the two-
dimensional'maching which will serve as a guide for its construction:
1 is 25X1
The machine will consist of the following construction e amen
(Baugruppen):
in Computingblement (Rechenelement)
/\`
b. Computing hear (Rechengetriebe) 25X1
(a) The ,e,)mputing ,lilement is a sinus generator. Its main part -'s a ceramic
plate on which colloidal carbon is sprayed. The plate is provided with
contacts in such away that a square-shaped or rectangularly-shaped surface
is available for operation. A sinus function is generated through circular
scanning of the coal surface of this plate. The coal plates have already
been successfully tested in the one-dimensional Fourier synthesis machine
which was developed as a preliminary stage for the big two-dimensional
version. Results of the tests made it clear that the same type of sinus
generator can be used for the two-dimensional machine. Adjustment of the
phases is carried o t through rotation of the phase relative to the normal
position of the driving axis by means of.a motor and a planet gear. Each
element is provided with an indicator so that it will be possible to
control the adljustment of phases during the operation and to change it.
The individual elements are connected with the Aervice device through
a selector (Ziffernwaehleinrichtung) for the setting of phase and ampli-
tude values. The following'is the required accuracy of the plates:
c. Service.dtvice (Bedienungsgeraet)
d. Amplifier (Verstaerker)
e. Equipotential,divider (Aequipotentialteiler)
f. Observation device (Sichtgeraet).
CLASSIFICATION SECRET 25X1
I I
Approved For Release 2007/08/30: CIA-RDP80-00810A004700620001-4
 Approved For Release 2007/08/30: CIA-RDP80-0081 OA004700620001-4
SECRET CONTROL
U.S. OFFICIALS ON,Y
60
units:
0.25
percent
84
units:
0.50
percent
120
units:
1.00
percent
216
units:
2.00
percent
360
units:
4.00
percent
1) the central instrument for the adjustment of amplitudes, which
is planned as a projecting instrument with a large scale. Grad-
uation mark: 0.25; scale: 100 parts, changeable to 200 parts;
2) the central instrument for the adjustment of phases. Planned as
a DC rotary field system for projection. Scale: 360 degrees;
accuracy: 0.25 degrees;
3) a selecting installation with a scanning table (Zifferntast-
tableau). 22 line motor selectors with 12 channels at 50 contacts
each are planned. Also one group selector with 12 channels at
30 contacts each;
l1 ~~ (c) The,Service ,device consists of:
(b) Thedomputing,,tgear has to be complete with driving motors and control
installation for the exact regulation of the rotations. The rotation of
the stators has to be kept exactly constant through synchro-motcrs; the
rotation of the rotors also has to be kept exactly constant. The gear
will consist of four individual plates (Platinen), namely, three plates
with twenty times ten elemen** 2and one plate with twenty timesi-Akeaan
elements. Thus, there will be 840 elements2 with stators carrying out 1 to .
20 revolutions per minute and motors carrying out 60 to 1,200 revolutions
,,per minute. The gear bloc will be connected by cable only with the service
$evice and the Currenjt ;Ripply. The gears of all stat
by a central motor wit- exactly constant revolutions. a big size s
of the entire gear installation, the rotor parts of t t.e1 s will be
u.i-lveu uy several motors alstrlbutea on shafts with a`high der of
revolutions.
4) a potentiometer plate with 840 potentiometers for the adjustment of
amplitudes;
5) a control desk with an installation for the control and adjustment
of the revolutions of the motors driving the rotors;
6) a current supply installation consisting of 41 transformers each
with 22 separated secondary windings and 840 Graetz rectifiers
with a filter chain for the voltage supply of the individual elements.
(d) The amplifier is a cathode amplifier for the modulation of .the equipotential
divider loop. Electronic voltage stabilization. The required linear
deviation is 2 percent.
(e) The equipotential divider consists of 40 individual cadmium sulfide
crystals which are on a plexi-glass sheet and which are excited through
the light band of an oscillograph loop. All crystals are in parallel
two-dimensional model with 25 elements will be built. Work on this model
2. Before actual work on the big two-dimensional machine will start, a small
~~ d> "(tro
hot
)
c
rog.
(f) The observation. device consists of two large-type projection tubesAwhich
can be operated successively and which are provided with optics and
photographic installations. 16 millimeter camera. An 18 kV high-voltage
instrument will supply the anode voltage for the projection tubes.
is to start in June 1954.
JI Comment. 840 seems to be the correc
t number of elements, although
given above seem to refer to 820 elements only.
SECRET COT'ITRbL
U.S, OFFICIALS ONLY
Approved For Release 2007/08/30: CIA-RDP80-0081 OA004700620001-4
 Approved For Release 2007/08/30: CIA-RDP80-0081 OA004700620001-4
Approved For Release 2007/08/30: CIA-RDP80-0081 OA004700620001-4