CONTENTS
| CHAPTER | PAGE | |
| I | On a live Wire | 1 |
| II | "We'll Take a Chance!" | 14 |
| III | Planning a Big Gun | 22 |
| IV | Koku's Brave Act | 29 |
| V | Off to Sandy Hook | 40 |
| VI | Testing the Waller Gun | 48 |
| VII | The Impossible Occurs | 58 |
| VIII | A Big Problem | 65 |
| IX | The New Powder | 72 |
| X | Something Wrong | 80 |
| XI | Failure and Success | 87 |
| XII | A Powerful Blast | 97 |
| XIII | Casting the Cannon | 105 |
| XIV | A Night Intruder | 115 |
| XV | Ready for the Test | 121 |
| XVI | A Warning | 131 |
| XVII | The Bursting Dam | 139 |
| XVIII | The Doped Powder | 151 |
| XIX | Blowing Down the Barrier | 158 |
| XX | The Government Accepts | 165 |
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