<P> David Bushnell (August 30, 1740--1824 or 1826), of Westbrook, Connecticut, was an American inventor, a patriot, a scholar, and a veteran of the Revolutionary War . </P> <P> Bushnell was born near Saybrook, Connecticut into a farming family . He was the first of five children born to Nehemiah and Sarah Ingram Bushnell . Following the death of his father circa 1769, he sold his half interest in the family Westbrook farm to his brother Ezra and entered Yale College in 1771 at the relatively old age of 31 . </P> <P> Bushnell is credited with creating the first submarine ever used in combat, while studying at Yale in 1775 . He called it the Turtle because of its look in the water . His idea of using water as ballast for submerging and raising his submarine is still in use, as is the screw propeller, which was used in the Turtle . </P> <P> While at Yale, Bushnell proved that gunpowder could be exploded under water . He also made the first time bomb . He combined these ideas by building the Turtle which was designed to attack ships by attaching a time bomb to their hulls, while using a hand powered drill and ship auger bit to penetrate the hulls . </P>

Who invented the submarine in the industrial revolution
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