Too little developer...?

[EthanFrank]

I'm trying to imagine how 10oz. could be enough to immerse two rolls at once. My little one-reel Nikor stainless tank already takes 8oz; and my two-reel Nikor is a 16 oz. tank. I wonder how Paterson accomplished this?

I really have no idea - hence my surprise when the negs worked out! They're not brilliant, but certainly usable for the most part.