 The ship was armed with a main battery of four 12 inch / 40 Mark 4 guns in two twin gun turrets on the centerline , one forward and aft . The secondary battery consisted of eight 8 @-@ inch ( 203 mm ) / 45 guns and twelve 6 @-@ inch ( 152 mm ) / 45 guns . The 8 @-@ inch guns were mounted in four twin turrets ; two of these were superposed atop the main battery turrets , with the other two turrets abreast the forward funnel . The 6 @-@ inch guns were placed in casemates in the hull . For close @-@ range defense against torpedo boats , she carried twelve 3 @-@ inch / 50 guns mounted in casemates along the side of the hull and twelve 3 @-@ pounder guns . She also carried two 1 @-@ pounder guns . As was standard for capital ships of the period , New Jersey carried four 21 in ( 530 mm ) torpedo tubes , submerged in her hull on the broadside . 
