Two types of persicopes....?
I've been reading the spec sheets on some subs and a lot of them have 2 different periscopes equipped, an "Attack" periscope and a "Search" periscope.
http://www.globalsecurity.org/milita...-688-specs.htm
http://www.globalsecurity.org/milita...-688-schem.htm
http://www.globalsecurity.org/milita...-774-schem.htm
What's the difference between the two? I can speculate, but its still a little unclear about why the two different types...
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