Re: 5" guns on ships
The 38 refers to the length of the barrel. It is 38 calibers long or 38 times the 5" bore diameter. The designation of the whole assembly is the Mark 12 5"/38 although I have heard a Gunner's Mate-Guns call it a Mark 38. I have messed with mortars and howitzers but accurate gunnery on a rolling ship is amazing. They can do it.
Warte nur, balde ruhest du auch.