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Just now i received an email from Carl Zeiss AG with a positive respond on a request for help finding info on the graticles in the periscopes.
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I exchanged some emails with the director of their museum last year. Looks like they had even less info than me in some areas
due to all their documentation having been taken by the allies after WW2. They were however collecting lots of data and much interested in expanding their museum, so it's a matter of time till they have all info. I know positively that there are microfilms with detailed reports (including pictures) of examination of german periscopes after WW2 in US national archives, but you need to go there and browse them, they are not in the internet.
For the record, I was also in contact with the curators of U505, U995 and Vessikko and they also have almost no info, nor are the periscopes installed in those subs longer operational. You just see black when looking through their periscopes.
