Why did some County-class cruisers have apparent bulges while others did not?
Short answerThey received different refits, and the visible additions were often partial measures constrained by the need to preserve speed.
NotesModernization schedules varied between members of the class, so photographs from different dates show different hull treatments. Even where a bulge-like structure appears, concern about speed meant it might not provide the depth and volume of a complete anti-torpedo bulge.