http://www.rutherfordjournal.org/article010106.html Frode Weierud's very recommendable paper on aspects of the Siemens Geheimschreiber types T52 a-b-c-d and e (G-Schreiber). As well as some on the Lorenz Schlüsselzusatz SZ40/42. Not always well understood, is the difference between the Lorenz secret type-writer types SZ40 and SZ42 versus Siemens SFM T52x series. Siemens systems deployed always integrated coding facilities. Whereas Lorenz employed regular telex apparatus (Fernschreiber), where the actual coding and decoding was being accomplished in a separate module. That is also expressed in the German word "Schlüsselzusatz"  meaning an external (Zusatz = additional) apparatus. The suffix 40 or 42 meaning the year of its introduction (acceptance in respectively 1940 and 1942). Colossus was particularly built to cover Lorenz type wireless controlled telex systems. Whereas particularly Siemens & Halske types T52d and T52e had to be broken by manual means. Causing huge delays of, sometimes, several weeks. Type T52e, which could communicate with its predecessor type T52d, as long as mode KTF was being switched off, brought an even higher degree of security. KTF mode of type 52d caused a quasi irregular motion stop of coding wheels (several out of 10 rotors). Although, it was meant to increase security it did, in some cases, the opposite when their signals was conveyed by means of radio waves. It has to be noticed though, that Siemens systems were mostly relying on 'wires' instead of wireless. The type e code-wheel module is shown in our new Klooster exhibition. The most secure type was Siemens type T43, which used a 'one time path' punch tape as message key. It has to be noticed, that Siemens G-Schreiber machines can be found in some museum collections, whereas SZ40/42 is an extremely rare artefact!

German Jamming Signals recorded by the BBC during the Second World War. Click on the record labels as to activate the sound recordings (new)

My Dutch friends Paul and Marc are both, among many other crypto related subjects, very dedicated Enigma collectors. They cooperate with Frode Weierud as to reconstruct the "life tree" of all Enigma derivates. They complain, by the way, that some facts put on "Wikipedia" are apparently incorrect and when these are being changed according their state of knowledge, thus the truth, it instantly is re-converted into the incorrect fashion again! Their knowledge is based on recent findings in a German archive. Relying, among many other documents, on official correspondence between the Enigma company in Berlin and German services. http://www.cryptomuseum.com/index.htm

A for historians very interesting dissirtation is: Anfänge der Halbleiterforschung und -entwicklung (in Germany, AOB). Dargestellt an den Biographien von vier deutschen Halbleiterpionieren. His Ph.D. at the Technische Hochschule Aachen, date 29 June 1999.       It reflects, of course in German language, very well the circumstances in which science and technology had to live and acting during the Third Reich era. The semi-conductor research in Germany is the backbone of this Ph.D., 260 pages, worth reading!!http://darwin.bth.rwth-aachen.de/opus3/volltexte/2008/2517/pdf/Handel_Kai.pdf  

A.    Dutch language webpage about Y-stations in Holland like Teerose. Whereabouts of some German services. Quite interesting page. Interesting photo of the Y-range measuring display unit.        http://home.kpn.nl/witie/radiopeilstations.htm

B.    The same website as the previous one, but now on German fighter aircraft during Operation Market Garden (Arnheim September 1944)  http://home.kpn.nl/witie/Jagerinzet.htm

C.    Belonging to the two previous ones, but subject dealing here with the huge command bunker "Dioganes", which was demolished inside after the Battle of Arnhem  was over  http://home.kpn.nl/witie/Diogenes.htm

D.    Article on the first jet-fighter-aircraft which crashed in Holland September 1944       http://home.kpn.nl/witie/Me%20262.htm

E.    Exploiting enemy radiations, Klein-Heidelberg etc.        http://home.kpn.nl/witie/Meteo-meldingen.htm

Please consider also the nice virtual Swiss technical museum website:  http://www.technik-museum.ch/

Der Analogcomputer als Medium der Zeitmanipulation. The occasion was: Medienzeit als Provaktion von Mediengeschichte. A very interesting contribution on the subject of aspects of analogue computing! By Teresa Busjahn. Held at the Humbolt-University of Berlin, Seminar für Medienwissenschaft. SoSE 2008.    It is a pity that this link is no longer available at the Humbolt University webserver:  http://www.medientheorien.hu-berlin.de/theorien/hausarbeiten/Busjahn_Analogcomputer.pdf. However, it is also directly available at our website: Analogcomputer als Medium der Zeitmanipulation, by Teresa Busjahn

An interesting source of information is the dissertation by Michael Brian Petersen, of 2005 (Ph.D. of Philosophy). Title: ENGINEERING CONTENT: PEENEMUENDE, NATIONAL SOCIALISM, AND THE V-2 MISSILE 1924-1945. Consisting of 451 pages! University of Maryland, College Park Maryland: http://www.lib.umd.edu/drum/bitstream/1903/2861/1/umi-umd-2357.pdf

Luca Fusari's website. Luca is an Italian collector who now showing some interesting aspects on the Köln E52 motor tuning module (see video clip)

http://www.eclipse.net/~dhamer/downloads/SFMT43neu.PDF Mr. Josef Langer from Vienna, has published a paper on Germany's most secure teletype apparatus type SFM 43, which security was never broken during WW II. It used a so-called "one time path" which is most likely unbreakable. A given punched tape is put in an integrated second punch-tape reader. The actual code is being mixed with the to be transmitted or received message

Just after a particular webpage on the ES111 was created (23 February 2010), my friend Tom Going, being also a member of the IEHG (International Electronics History Group), brought to our attention the very nice German website on the TV set E1 of 1939. It shows many photos of this set, including the ones from what is inside this intriguing TV apparatus.

Please activate this hyperlink as to approach this interesting web page

We recently received an interesting link conserning a German Wartime military film in which is delat with aspects of their current electronic warfare. High Frequency as a weapon (New source, PA 0 MER provided this link)

An interesting paper on classical time keeping (quartz): http://www.leapsecond.com/pages/marrison/

 http://www.leapsecond.com/pages/marrison/#The Frequency Divider

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