>>64212692
>>64212742
thats the place for the Verfolgungsgeschütz i.e. hunter gun to fire in the back of fleeing ships which wont be engaged by the main artillery if they are to close or to be boarded.
>>64211142
here's some side stacked casemattes on SMS St.Georg for the casematte connoisseur
>>64212779
that is an optic instrument to sight in the main gun, not a salute cannon.