Description
Derived from the Baltimore-class heavy cruisers, they were larger, had an improved machinery layout, and carried a new design of auto-loading, rapid-fire 8"/55 gun (the Mk16). The improved Mk16 guns of the main battery were the first auto-loading 8" guns fielded by the US Navy, and allowed a much higher rate of fire than earlier designs, capable of sustaining 12 shots per minute per barrel, or about twice that of the Mk12s found on the Baltimore class. The auto-loading mechanism could function at any elevation, giving even these large-caliber guns some anti-aircraft ability. While the secondary battery of six twin 5"/38 Mk12 DP guns was essentially unchanged from the preceding Oregon City and Baltimore class cruisers, the Des Moines class carried a stronger battery of small-caliber anti-aircraft guns, including 12 twin 3-inch/50 Mk27 and later Mk33 guns, that were considered superior to the earlier ships' quad-mounted 40mm Bofors against then current airborne threats.
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