Industrial Revolution, Steam Engine, Steamboat, & the Battle of Ironclads: CSS Virginia (Merrimack) & USS Monitor - "Naval Warfare had been Revolutionized" - American Minute with Bill Federer
When offered payment for designing the Monitor, John Ericsson, who "had a particular horror of slavery," replied to a U.S. Senator in 1882:
"Nothing could induce me to accept any remuneration from the United States for the Monitor ... It was my contribution to the glorious Union cause ... which freed 4,000,000 bondsmen."