ZEISS PRODUCTION OF SCHLIEREN DEVICES

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP82-00457R014200440001-9
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 2
• Document Creation Date: December 20, 2016
• Sequence Number: 1
• Publication Date: October 20, 1952
• Content Type: REPORT

SECURITY INFOI=TION
CENTRAL INTELLIGENCE AGENCY
INFORMATION REPORT JQD NO.
COUNTRY East Germ my
DATE DISTR. 20 October 1952
SUBJECT Zeiss Production of Schlieren Dwriees NO. OF PAGES 2 25X1
NO. OF ENCLS.
(LISTED eE1.0W)
SUPPLEMENT TO
REPORT NO.
Approved For Release 2007/03/02 : CIA-RDP82-00457R01420044000 9 25X1
CLASSIFICATION SECRET
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CLASSIFICATION
8
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I,. VEB Carl Zeiss, Jena, has produced four large Schlieren devices and de-
livered"tthem to the Russians. The last one of these four was delivered in
October 19541, All four were delivered to the Berliner Technisches Biiro
(BTB) in Berlin.Adlershof, formerly part of SAG Avtovelo, but now af-
filiated with SAG Transmasch. BTB shipped three of the devices to Russia;
one has remained with BTB.
2. All four instruments delivered to BTB were of the same type. They have a
total length of seven to eight meters; a measurement opening (MessOffnung)
of 30 centimeters and a measurement distance (Messtrecke) of 80 to 100
centimeters. All were constructed for horizontal use only.
3. In February 1952, BTB ordered for the Russians four more Schlieren devices
from Zeiss. Two of these are to be of exactly the same type as those de-
livered previously. The other two are to be constructed'for vertical use,
so that combustion processes in a glass cylinder can be studied. It was
specified that construction of the device should allow the investigation
of the combustion processes in the direction of the cylinder axis. Zeiss
accepted this order and has constructed the necessary optical systems. The
Russian order calls for delivery of the first instrument on 1 December 1952,
the others by 1 May 1953, Zeiss will only be able to comply with these de-
livery terms if it gets so-called compur and compound shutters from the
Deckel firm in Munich. These shutters are provided with pneumatic pumps to
achieve exposures of one twelve hundredth of a second and slower. Deckel
delivered the shutters for the four devices previously produced by Zeiss for
the Russians.
Li. The Russian request for construction of two of the devices for vertical use
raised some difficulties. These result from the fact that the cylinder walls
will distort a picture of the combustion. Dr. Carl August Sonnefeidt of the Tele-
scopic Department of Zeiss, who returned from Russia in the fall of 1951,
overcame the problem by building a special glass cylinder whose bottom
(Kolben) is used as a mirror and in which two cylinder-lenses with non-
coincident foci (Afokale Zylinderlinsen) are attached. The result is a field
of vision covering two-thirds of the cylinder diameter without distortion.
5. Zeiss set the price of the-new Schlieren devices at approximately 170,000
DM East each. A device in the earlier delivery was sold for 138,000 DM East,
SECRET
DISTRIBUTION
THIS IS UNEVALUATED INFORMATION
 Approved For Release 2007/03/02 : CIA-RDP82-00457RO14200440001-9
SECRET
6,. In addition to the above-mentioned large type Soblieren device, Zeiss developed in
1951 a smetller instrument; this man not ordered by the Russians. Zeiss intends to
put it on the market in i953a' The instrument's measurement opening is eight to
ten centimeters; its measurement distance varies from 2 to 15 centimeters. The
light source is interchangeable; mercury lamps, nitra lamps am carbon electrodes
can. be used with the same device Ten of them are being built for completion in
19530
Approved For Release 2007/03/02 : CIA-RDP82-00457RO14200440001-9