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http://www.elenco.com/admin_data/pdffiles/EDU61007.pdf
The thought of the Paddle Wheel Boat was created by Leonardo Da Vinci in one of his drawings. -
http://en.wikipedia.org/wiki/Steamboat
Jonathan Hulls patented the steam-powered boat with the help of James Watt. -
http://en.wikipedia.org/wiki/Paddle_steamer
A double-hulled Paddle Steamboat was sailed by many men on the "Firth of Fourth". -
http://en.wikipedia.org/wiki/Motorboat
The first motor boat was used by the inventor, John L. Hacker.
