| PAGE | |
| U. S. Submarine M-1 | Frontispiece |
| Cornelius Van Drebel | 5 |
| The Rotterdam Boat | 8 |
| Symons’s Submarine | 10 |
| The Submarine of 1776 | 13 |
| The Best-known Picture of Bushnell’s Turtle | 16 |
| Another Idea of Bushnell’s Turtle | 19 |
| Ezra Lee | 21 |
| The Nautilus Invented by Robert Fulton | 28 |
| Destruction of the Dorothea | 33 |
| Views of a Confederate David | 37 |
| C. S. S. Hundley | 38 |
| Cross-section of a Whitehead Torpedo | 51 |
| Davis Gun-torpedo After Discharge, Showing Eight-inch Gun Forward of Air-flask | 53 |
| Effect of Davis Gun-torpedo on a Specially-constructed Target | 54 |
| The Intelligent Whale | 58 |
| Le Plongeur | 59 |
| Steam Submarine Nordenfeldt II, at Constantinople, 1887 | 62 |
| Bauer’s Submarine Concert, Cronstadt Harbor, 1855 | 65 |
| Apostoloff’s Proposed Submarine | 67 |
| The Holland No. 1 | 70 |
| The Fenian Ram | 73 |
| U. S. S. Holland, in Drydock with the Russian Battleship Retvizan | 77 |
| John P. Holland | 80 |
| Lake 1893 Design as Submitted to the U. S. Navy Department | 83 |
| The Argonaut Junior | 84 |
| Argonaut as Originally Built | 87 |
| Argonaut as Rebuilt | 90 |
| The Rebuilt Argonaut, Showing Pipe-masts and Ship-shaped Superstructure | 93 |
| Cross-section of Diving-compartment on a Lake Submarine | 94 |
| Cross-section of the Protector | 97 |
| Mr. Simon Lake | 98 |
| U. S. Submarine E-2 | 101 |
| A Submarine Cruiser, or Fleet Submarine (Lake Type) | 105 |
| Auxiliary Switchboard and Electric Cook-stove, in a U. S. Submarine | 107 |
| Forward Deck of a U. S. Submarine, in Cruising Trim | 109 |
| Same, Preparing to Submerge | 110 |
| Depth-control Station, U. S. Submarine | 113 |
| Cross-section of a Periscope | 114 |
| Forward Torpedo-compartment, U. S. Submarine | 117 |
| Fessenden Oscillator Outside the Hull of a Ship | 120 |
| Professor Fessenden Receiving a Message Sent Through Several Miles of Sea-water by His “Oscillator” | 121 |
| Side-elevation of a Modern Submarine | 127 |
| One Type of Safety-jacket | 131 |
| The Vulcan Salvaging the U-3 | 134 |
| Fulton’s Anchored Torpedoes | 140 |
| Sinking of the U. S. S. Tecumseh, by a Confederate Mine, in Mobile Bay | 143 |
| A Confederate “Keg-torpedo” | 144 |
| First Warship Destroyed by a Mine | 145 |
| A Confederate “Buoyant Torpedo” or Contact-mine | 146 |
| Modern Contact-mine | 150 |
| U. S. Mine-planter San Francisco | 153 |
| English Submarine Rescuing English Sailors | 157 |
| Engagement Between the Birmingham and the U-15 | 159 |
| Sinking of the Aboukir, Cressy, and Hogue | 163 |
| Tiny Target Afforded by Periscopes in Rough Weather | 167 |
| Photograph of a Submarine, Twenty Feet Below the Surface, Taken from the Aeroplane, Whose Shadow Is Shown in the Picture | 173 |
| German Submarine Pursuing English Merchantman | 182 |
| British Submarine, Showing One Type of Disappearing Deck-gun Now in Use | 190 |
About This Book
The book traces the development of underwater craft from early experimental diving bells and primitive submersibles through pioneering inventors and Civil War experiments, recounting milestone devices and the emergence of torpedoes. It explains technical principles—hull forms, propulsion, periscopes, and safety apparatus—while comparing competing designs and firms with photographs and diagrams. One imaginative chapter offers a speculative voyage inside a modern boat. Final sections examine mines, tactical uses and blockades, questions about neutral shipping, common accidents and rescue methods, and the evolving role of submarines in contemporary naval warfare.