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"Clipper Ship": http://www.ballarat.edu.au/external/sorhill/gold150/5650.gif
"John Ericsson": http://www-invent-org.nforce.com/book/bool-text/40.html
"Robert Fulton": http://www.history.rochester.edu/steam/dickinson/
"Monitor": http://www.cwc.lsu.edu/pictures/ironclad.htm
* Permission was granted for the use of the illistations from the respective web pages.
* A special thanks to Brian "Ernie" Johnston for all his help.