Swedish engineer who came to America where he designed the sloop-of-war Princeton which became the first screw-propelled naval ship steamer and the first warship to have all her machinery below the waterline away from broadside shot. When the Navy needed a response to the ironclad Merrimac, he designed and built in ninety days the highly effective Monitor. He also designed Monitor’s revolutionary concepts: rotating turrets and hoists for raising ammunition from stowage.
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