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| DOUBLETONES |
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| PAGE |
| Simon Lake | Frontispiece |
| The Pigmy Conquerer of the Sea | 2 |
| Storage Battery Cell | 14 |
| A Submarine Cell Completely Assembled Ready for Installation | 14 |
| On Picket Duty | 20 |
| The Lower Portion of Galileo Periscope | 22 |
| The Voice and Ear of the Submarine | 26 |
| Torpedo Tubes Assembled Ready for Installation in a Submarine Boat | 27 |
| A Whitehead Torpedo | 28 |
| Rear End of the Whitehead Torpedo | 29 |
| Rapid-firing Guns | 30 |
| A Modern Submarine Cruiser, or Fleet Submarine (Lake Type) | 32 |
| The Launching of the "Protector" | 62 |
| The "Delphine" | 66 |
| The "Fenian Ram" | 96 |
| "Argonaut, Jr.," 1894 | 128 |
| Sketch of the Confederate Submarine "Hunley" | 150 |
| The New Orleans Submarine | 152 |
| The "Intelligent Whale" | 153 |
| "Argonaut" as Originally Built. Launched in August, 1897 | 176 |
| Submarine with Cushioned Bottom Wheels | 178 |
| The "Argonaut" after being Lengthened and Rebuilt, in 1898, Showing Ship-shaped, Watertight, Buoyant Superstructure | 182 |
| The "Holland" Running on the Surface | 190 |
| "Amphibious" Submarine | 202 |
| The "Protector" (Lake Type, 1901-1902) | 210 |
| Official Drawing of the Captured German Mine-planting Submarine, U C-5 | 214 |
| A Bottom-Creeping Submarine Passing Through a Mine Field | 216 |
| A Mine and Net Evading Submarine Under-running a Net | 217 |
| Mines Placed Under Ships at Anchor | 220 |
| Submarine Supply Station | 221 |
| Submarine "Seal"—Lake Type U.S. | 226 |
| British Submarine B-1 (Holland type) | 227 |
| British Submarine C-2 Arriving at Portsmouth in a Gale | 230 |
| Germany's U-9 and Some of Her Sister Submarines.—Aeroplane and Submarine | 234 |
| Russian Cruiser-Lake Type Submarine in Shed Built by Peter the Great—1905 | 236 |
| A Group of German U-boats | 238 |
| Russian-Lake Type Cruising Submarine "Kaiman" making a Surface Run in Rough Weather in the Gulf of Finland | 239 |
| The U-65 | 242 |
| Russian-Lake Type | 243 |
| C-1, One of the Later Type French Submarines | THE SUBMARINE IN WAR AND PEACE
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