| DOUBLETONES | |
| 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 | [248] |
| Cargo-Carrying Submarines of the Author's Design | [249] |
| The "Deutschland" | [252] |
| Torpedo being Fired from the Deck Tubes of the Submarine "Seal" | [256] |
| British Submarine No. 3 Passing Nelson's Old Flagship "Victory" | [257] |
| Under-ice Navigation | [260] |
| A Submarine Garden at the Bottom of the Sea | [266] |
| Submarines for Hydrographic Work and Wreck Finding | [267] |
| The "Argonaut" Submerged | [276] |
| Experimental Cargo-Recovering Submarine | [278] |
| Sketch Drawing Illustrating a Method of Transferring Cargoes from Sunken Vessels to Submerged Freight Cargo-Carrying Submarines | [278] |
| Semi-submergible Wrecking Apparatus | [280] |
| Submarine Oyster-Gathering Vessel | [286] |
| The "Argosy and Argonaut III" | [290] |
| Diagram of the "Argosy and Argonaut III" | [291] |
| LINE CUTS | |
| Method of Control in Diving Type Boats | [17] |
| Method of Controlling Hydroplane Boats | [18] |
| How Hydroplanes Control Depth of Submersion | [19] |
| Showing Various Conditions in Which a Submarine of the Level Keel Type Fitted with Bottom Wheels, May Navigate | [21] |
| The Periscope is the Eye of the Submarine | [23] |
| Diving Compartment | [31] |
| Bushnell's Submarine, the "American Turtle" | [79] |
| Robert Fulton's Submarine | [82] |
| Tuck's "Peacemaker" | [84] |
| Longitudinal Section of the French Submarine "Le Plongeur" | [153] |
| The "Plunger" (Holland Type Submarine), Launched in August, 1897 | [167] |
| Lake Design as Submitted to the U. S. Navy Department in 1893 | [170] |
| The "Argonaut" after Lengthening and Addition of Buoyant, Ship-shaped Superstructure, Increasing the Surface Buoyancy over 40 Per Cent | [178] |
| The "Holland" | [190] |
| Various Types of Modern Foreign Submarines | [194] |
| An Amphibious Submarine being Hauled out of the Water | [204] |
| The "Caviar Map" of Shipping's Greatest Grave-yard | [283] |
| CHART | |
| Diagram to Illustrate the Comparative Visibility and Consequently | |
| the Comparative Safety of Surface Ships and Cargo-Carrying | |
| Submarines | [254] |
THE SUBMARINE IN WAR AND PEACE
[INTRODUCTION]
Jules Verne, in 1898, cabled to a New York publication: "While my book, 'Twenty Thousand Leagues Under the Sea,' is entirely a work of the imagination, my conviction is that all I said in it will come to pass. A thousand-mile voyage in the Baltimore submarine boat (the Argonaut) is evidence of this. This conspicuous success of submarine navigation in the United States will push on under-water navigation all over the world. If such a successful test had come a few months earlier it might have played a great part in the war just closed (Spanish-American war). The next war may be largely a contest between submarine boats. Before the United States gains her full development she is likely to have mighty navies, not only on the bosom of the Atlantic and Pacific, but in the upper air and beneath the waters of the surface."
The fantasy of Verne is the fact of to-day.
Admiral Farragut, in 1864, entered Mobile Bay while saying: "Damn the torpedoes—four bells; Captain Drayton, go ahead; Jouett, full speed!"
An admiral, in 1917, damns the torpedoes and orders full speed ahead, but not toward those points guarded by submarine torpedo boats.