CONTENTSCHAPTER I [ON A LIVE WIRE]II ["WE'LL TAKE A CHANCE!"]III [PLANNING A BIG GUN]IV [KOKU'S BRAVE ACT]V [OFF TO SANDY HOOK]VI [TESTING THE WALLER GUN]VII [THE IMPOSSIBLE OCCURS]VIII [A BIG PROBLEM]IX [THE NEW POWDER]X [SOMETHING WRONG]XI [FAILURE AND SUCCESS]XII [A POWERFUL BLAST]XIII [CASTING THE CANNON]XIV [A NIGHT INTRUDER]XV [READY FOR THE TEST]XVI [A WARNING]XVII [THE BURSTING DAM]XVIII [THE DOPED POWDER]XIX [BLOWING DOWN THE BARRIER]XX [THE GOVERNMENT ACCEPTS]XXI [OFF FOR PANAMA]XXII [AT GATUN LOCKS]XXIII [NEWS OF THE MINE]XXIV [THE LONGEST SHOT]XXV [THE LONG-LOST MINE]