Finding range with Periscope

[Rosencrantz]

Hello everyone!


After years of research I'm still looking for detailed info how they find range to target with attack scope. What kind of scales there were in the scope? Just marks like we can see them in the SHIII attack scope? I doubt this. I think what you saw when looking in the real attack scope was much more complicated.

Heinz Schaeffer tells in his book "U-977" how you could see different "marks" when looking through the scope. Color of "marks" were red, green, yellow, black or white depending on what was their purpose. So, what are those marks? Any ideas? Marks for different mast heights?

In the fleet boats of US Navy the assistant approach officer checked the range from a special table after the approach officer has given him the estimated mast height. What I have read about U-boats, it looks to me approach officer was able to determine range to target with the scope or UZO without any need for assistant with tables.

I appreciate if someone could give me more info or send me a link or something where to look for, or share with me a good picture about what you saw when looking through the U-boats attack scope.


Greetings,
-RC-