3inch/50caliber 

Superstructure: 1927 - 1941

All AA guns (8 - 3") located on the superstructure deck. AA positions - dark blue circles,  red - circles5" guns.  In 1941, the aft guns were relocated for installation of the 1.1" machine guns.  Drawing from 1937 "Booklet of General Plans", C&R 17201