Ericsson,
John 1803-89; U.S. naval engineer & inventor, born in Sweden: builder of the Monitor
See Ericsson in American Heritage Dictionary 4
(ĕrˈĭk-sən), John 1803-1889.
American engineer and inventor who built the first ironclad warship, the Monitor (1862), which engaged the Confederate Merrimack in a famous naval battle of the Civil War (March 9, 1862).