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The Duane Arnold Energy Center (DAEC) was Iowa's only nuclear power plant.It is located on a 500-acre (200 ha) site on the west bank of the Cedar River, two miles (3.2 km) north-northeast of Palo, Iowa, USA, or eight miles (13 km) northwest of Cedar Rapids.
An increase in draft, vast additions to the armor, [N 3] and the substitution of twelve 6-inch (152 mm) guns in the secondary battery were common among the three designs. "A" was the largest, at 59,060 long tons (60,010 t) standard, and was the only one to still carry the twelve 16-inch guns in four triple turrets (3-gun turrets according to US ...
The first Iowa-class ship was laid down in June 1940; in their World War II configuration, each of the Iowa-class battleships had a main battery of 16-inch (406 mm) guns that could hit targets nearly 20 statute miles (32 km) away with a variety of artillery shells designed for anti-ship or bombardment work. The secondary battery of 5-inch (127 ...
Oerlikon 20mm AA gun mount on board USS Iowa (BB-61) Post–World War I battleships, particularly British and American, had discarded single purpose secondary batteries mounted in casemates used to engage surface targets in favour of turret-mounted dual purpose secondary batteries (5-inch or 6-inch caliber). Secondaries were initially designed ...
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The Iowa-class battleships were maintained and used because their 16" Mark 7 guns were considered more effective than the smaller 5" Mark 45 guns found on modern frigates, destroyers, and cruisers. Each battleship had a main battery of nine 16" guns and a secondary battery of twenty 5" guns, while the smaller modern ships have a single 5" gun.
The batteries could be used for big projects, such grid storage and integration with renewable energy, avoiding the danger of large fires. But it could also allow for smaller applications.
This is the same function as the main battery's Mark 8 Rangekeeper used in the Mark 38 GFCS except that some of the targets the Mark 1A had to deal with also moved in elevation—and much faster. For a surface target, the Secondary Battery's Fire Control problem is the same as the Main Battery's with the same type inputs and outputs.