Weopons Section of the LFA,


 BIOS 61

with notes on photographic methods used in German ballistics


Reported by

C.A. Adams

Armament Research Department

Ministry of Supply

Membership of the team was:

Dr. Maccoll    (A.R.D.)

Dr. Hankins    (N.P.L.)

Mr. Illingworth    (A.R.D.)


BIOS Target Nos.

C 9/469, C 2/662


Keywords:    Organisation if L.F.A. and personnel interviewed; General description of the weapons section of L.F.A.; Lay-out and general functions of the reduced presure tunnel and the cross wind tunnel; General description of the experimental technique used in the low-pressure tunnel; Details of triggering apparatus ... ; General state of buildings and apparatus; Quality technique; High speed Schlieren photography in the Engineers Institute; Work on terminal ballistics at Krupps, Essen up to 1943 (information from interviews with Prof. Rossmann); High Speed potography undertaken by the 'Reichs Anstalt für Film und Bild"; Bore temperature, pieze-electric and low temperature gun functioning measurements in W-2 and W-3; ... Col. Simson (C.I.O.S. Target No. 25/71) Col. Simson US later wrote an interesting book on German techniques, very much more posotive than most British reports did, AOB);

... Large guns, or guns mounted in aeroplanes can be brought to the outside of the firing point, which can be opened to allow firing in these conditions at atmosphere presure. When sealed a pressure of .02 atm. can be reached and it was stated that further reduction to 0.1 atm. was planned. .. The cross wind tunnel is associated with the low pressure tunnel to the extent that ... ; Deutsche Akademie der Luftfahrtforschung 1942 ... ; Space time measurements, the space time curve is obtained from the passage of the projectile through Al.foil screens. These are stated to have a negligible effect on the velocity of the shot ... ; Photographic measurements .. ; Blitzgeber  ... the main is oscillatory but it is claimed that ... ; Verteilergerät fd dreifach-Blitzgeber .. WB 0984 .. ; The photo-electric screen ; High speed Schlieren photography in the Engines Institute (Prof. Schmidt) ... synchronisation of the beginning of the spark discharge with the initiation of the explosion was arranged by a pendulum ... ; The picture was recoded on contnously moving film with linear speed of approx. 7.5 cm/millisecond the picture being about 3 mm. Hence, at 25,000 frames/sec. the bounderies of one picture and the next were nearly touching ... ; From 1930 to 1942 Prof. Rossmann directed scientific research at Krupps, Essen ... the well know system of Cranz and Scharding was used in conjunction ... ; Since these reports show that development of Kerr cell photography had been initiated earlier and taken further than similar work in the U.K. a summary of the essentials of the German wethod as ... exposure time which can be tolerated in only about one microsecond ... By using spark-shadow photography .... ;The Kerr cell shutter .... Dr. Schardin .. Dr. Fünfer .. Dr. Elle .. Dipl.-Ing. Turetschek .. Dipl.-Ing. Weohl? .. Dipl.-Ing. Struth .. Dipl.-Ing. Kling .. Dr. Thomer .. Dipl.-Ing. Vollrath .. ; Supply of the polarising screen material, which was produced by Zeiss-Ikon, would be of great value in the development of Kerr cell cameras in the A.R.D. and it is recommended that if any is available it should be obtained (confiscated, AOB!) for this purpose. ; .. a camera built by A.E.G. (Zeitdehner) with a speed of 48,000 frames per second .. 'On 31.7.45 Major White kindly supplied me at G(T) & C.W. 21st Army Main H.Q. with a list of reports obtained by him from Dr. Gottlard Wolff head of the 'Abteilung Technische Forschungsfilm' of the Reichs Anstalt für Film und Bild'..


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