The Big-Bang Cannon is an American toy cannon first manufactured in the early 20th-century. Numerous consumer fireworks injuries convinced a physics professor at Lehigh University (Bethlehem, Pennsylvania) to patent a "Gas Gun" in 1907, and the manufacturing of Big-Bang Cannons started in 1912, from the Gas Cannon Company. A bombing plane, tank, boat and pistol were manufactured during the 1920s, firing on the same principle as the cannons. 1930s designs included a Giant Roller Coaster, Ro-To-Top, Spinning Top, Field Glasses and G-Gun.