Flat Bulkhead Tankage

This website...

http://www.astronautix.com/stages/satkhead.htm

...mentions a "flat bulkhead" for a possible Saturn IC revision that
"consists of multiple conical sections."

Does anyone have a handy (on-line) diagram of such an arrangement? I
think of cones as being round, like ice cream cones, and fail to see
how they'd be cobbled together into something that could be called
flat.

Mike Miller

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