One of Baltimore's more endearing symbols is that of the Emerson Bromo-Seltzer Tower.   Built in 1911, it was the tallest building in the city for a decade at 289 feet.  It was constructed for "Captain" Isaac Emerson, who invented Bromo-Seltzer (acetaminophen, sodium bicarbonate and citric acid).   Today, this historic building houses space for visual and literary artists.