The mount (pit) for the M1888 10" Disappearing Gun of Battery Adams. Named for Captain John G. B. Adams, who was seriously wounded at the Battle of Gettysburg (July 1-3, 1863) where he also won a Medal of Honor for distinguished gallantry in action, this was one of the first batteries built during the Endicott Period of American seacoast defense. It was unfortunately built with cheap concrete, which began to deteriorate almost as soon as it dried in 1899, and the battery was pronounced unusable and deactivated by 1914.