Were the Roberts-class torpedo bulges intended only for protection, or also to create a more stable gun platform?
Short answerThey were deliberately fitted for protection, while the improved gun-platform stability was a useful secondary benefit.
NotesThe Roberts-class monitors carried conspicuous torpedo-defense bulges around their hulls. Protection from underwater damage was their deliberate design purpose. The wider form also helped steady the ship as a gun platform, but that was an added benefit rather than the primary reason for the bulges. The distinction separates the design requirement from a welcome performance side effect.