If the human cannonball were shot out of the cannon at 500 miles per second (and assuming no air resistance), it would take him approximately 50 seconds to make the trip around the world.
The opening indicates this is the Jingling Bros. Circus, but the main tent shows 'LS Circus' - The 'LS' should have been 'JB'.
After Hotfoot Hogan crosses the hot coals and sits down, there is a fade to the cannon (for the human cannonball act). As the fade begins, Hotfoot Hogan disappears.