Tonight's submarine talk dives into history

"David Bushnell's ‘Infernal Machine'" will be the subject of an illustrated talk at the Plainville Historic Center, 29 Pierce St., tonight, April 15, at 7 p.m. Bushnell, of Saybrook, invented the world's first fully operational submarine, the American Turtle, at the time of the American Revolution. The event is being sponsored by the Plainville Historical Society.