USS Iowa Main Battery under construction.

USS Iowa Main Battery under construction.

US Navy Battleships

A forward turret being constructed aboard USS Iowa BB-61 in 1942. Note the 0.75 in (1.9 cm) STS steel plates making up the gun house sides. To this will be bolted 9.5 in (24.1 cm) Class A armor plates. The turret back was 0.75 in (1.9 cm) STS over which was 12.0 in (30.5 cm) of Class A armor plate. The turret face, not yet in place in this photograph, was made up of 2.5 in (6.4 cm) STS steel over which was 17.0 in (43.2 cm) of Class B armor plate, equivalent to a single plate 18.75 in (47.6 cm) thick. The turret roof was 0.75 in (1.9 cm) STS over which was 7.25 in (18.4 cm) of Class B armor plate. Note the tower foremast in the background. U.S. Naval Historical Center Photograph # K-515.

US Navy

DiGiulian, Tony. “16’/50 (40.6 Cm) Mark 7.” NavWeaps , 1942. http://www.navweaps.com/Weapons/WNUS_16-50_mk7.php.

Naval Weapons