who designed the turtle america’s first submarine
Turtle (submersible) According to Dr. Benjamin Gale, a doctor who taught at Yale, the many brass and mechanical (moving) parts of the submarine were built by the New Haven clock-maker, engraver, silversmith, brass manufacturer and inventor Isaac Doolittle,[4] whose shop was just a half block from Yale.[5] Though Bushnell is given the overall design credit for the Turtle by Gale and others, Doolittle was well known as an "ingenious mechanic" (i.e. an engineer), engraver, and metalworker.[4] He had both designed and manufactured complicated brass-wheel hall-clocks, a mahogany printing-press in 1769 (the first made in America, after Doolittle successfully duplicated the iron screw),[6][7] brass compasses, and surveying instruments. He also founded and owned a brass foundry where he cast bells. At the start of the American Revolution, the wealthy and patriotic Doolittle built a gunpowder mill with two partners in New Haven to support the war, and was sent by the Connecticut government to prospect for lead.[8]