Interrogation of German

Television and Electronic


FIAT 294


Office of Military Government for Germany (U.S.)

Office of the Director of Intelligence


3 October 1945



R.H. McCarthy    U.S.

J.R. Townsend    U.S.

P. Mertz    U.S.

Technical Industrial Intelligence Committee


Keywords:    Targets: Dr. Karolus; Dr. Ludwig Wesch; Dr. Bothe; Dr. Carl Bosch; Dr. Bernhardt Bartels;

Dr. Karolus Professor at University of Leipzig Rohrbacherstrasse 79 Heidelberg, Germany

Dr. Karolus discussed larger screen experiments with television. He described his own, which used individual lamps for the picture elements, swithed mechanically for the lines and electronically for the for the elements in the lines. This had been set up at Leipzig and shown to Col. Ranger. It was used with a 200 line television system, and gave fair results.

Dr. Karolus described dark trace tubes (Blauschrift Röhre)  that he and dr. Bartels had worked with. These consist of a layer of KCP deposited on a thin layer of tungsten (Wo) (translucent) which itself is deposited on a layer of SiO2 (or thin quartz). The principle trouble with these is that whengood contrast is obtained the erasing time is long. ...    Dr. Karolus also briefly discussed the Krawinkel storage system which has been described in detail in german literature. He considers the swithing arrangement for it too complicated. ...

He described briefly a high speed facsimile system, which he had been working on and had shown to Col. Ranger. This uses a band of 10 kHz about 10 times the usual speed. It employs a supersonic light valve at the receiver, somewhat similar to the Scophony valve except that it does not need an immobilizer because at the speed required the motion of the wave train in the liquid cell (KERR cell?, AOB) is fast enough for the delaay across the aperture to be negliable compared to the time of one picture element. This fast system he was expecting to use on the German broad band networks.

Dr. Ludwig Wesch, Director of the Insitutes für Weltpost und Weltnachrichten and Elektrooptisches Institut. Prison Heidelberg - held for Nazi activities

Discussions on:    Phosphors - Dielectric constant photocells - Dielectrics for bolometers - trides and magnetrons for cm. waves - Capacity feed back generator using dielectric constant photocell (??, AOB) - General sork on infra-red - High presure high temperature oven (for phosphors) - Absorption of cm. waves - Problems of remote control of moving vehicles, such as planes, gliders, and rockets ...

Dr. Bothe Director Institute Physics Kaiser Wilhelm Institut Heidelberg   

Dr. Carl Bosch    Schlosswolfsbrbunnen Weg 61, Heidelberg       

Compact High Tension Generator ...

Dr. Bosch described a especially fine graine phosphor which he had prepared principally for the "Bildwandler" infra-red tube, but could also be used for cathode ray tubes generally ...

The phosphor is made up as a solution in water of zinc cadmium sulphide ....

Dr. Bernhardt Bartels    Rohrbacher Str. 79 Heidelberg

Silicon detector cells (Bartel Cell)    The original idea of this cell was a suggestion of Dr. Gunther (Günther?, AOB) of the University of Breslau, a chemist and specialist in semi-conductors.

A series of cylindrical rods of carbon 1.5 mm in diameter and a convinient length are introduced into a quartz tube and arranged so that they stand on end. Some powdered aluminum (aluminium, AOB) is introduced into the end of the tube ....



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