Because at my anterior post of the research on the properties of the german helmets in 1944, I find the source: An finder-seeker-Search server. As you know, because I am an spaniard, I dont says all you about the impressive possibilities of this machine. Put in the case search "periscope", for example.

Please post your comments. Many thanks.

Defense Technical Information Center: Search

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La llave de la libertad es la sabiduria. El cerrojo de la esclavitud la ignorancia

U-Historia, Ubootwaffe 1939-1945 History of UBootwaffe in Spanish
http://www.tradiweb.com/ta.htm Translator Web
http://www.forospyware.com In Spanish

It works! Itested for M-551 and got this:

Defense Technical Information Center: Search

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