In the 1850s Nobel lived in the U.S. & studied under John Ericsson, the builder of this first Union ironclad warship
Throughout the 1850s he followed the usual ship-to-shore routine, serving on 
vessels ..... 8 John Ericsson, in a speech before the New York Chamber of 
Commerce, ... under the guns of the fort waiting for an opportunity to slip through 
the Union blockade.