| | PAGE |
| “A Word to You” | vii |
| CHAPTER |
| I. | The First of the Submarines | 1 |
| How the Submarine Came to Be.—The Development of the Submarine.—The First Submarine Boat.—A Submarine of the Revolution.—The First Torpedo Fired by a Submarine.—Robert Fulton’s Submarine.—The Earliest Steam Propelled Submarine.—The Coming of the Torpedo-Tube Submarine.—The Invention of the Electric Submarine.—What the Gas Engine Did for the Submarine.—The Two Types of Submarines. |
| II. | How to Make and Work a Model Submarine | 23 |
| The Ballast Tank.—The Air Control Mechanism.—About the Power Plant.—The Pusher Control Device.—The Propeller-Shaft.—Installing the Motor.—Ballasting the Boat.—Making the Superstructure.—And Now the Conning Tower.—Setting the Propeller.—Putting on the Rudder.—Painting Your Craft.—How to Work Your Submarine. |
| III. | How a Real Submarine Is Made and Works | 51 |
| The Parts of a Submarine.—How the Hull Is Made.—What the Superstructure Is.—The Outside of the Conning Tower.—A Look Inside of the Hull.—A Peep into the Conning Tower.—Now the Navigating Compartment.—Next, the Diving Control Compartment.—The Four States of the Submarine.—How a Submarine Dives.—The Ballast Pumps and What They Do.—What the Buoyancy Tanks Are For.—Compressed Air and Air-Compressor Pumps.—Inside the Torpedo Compartment.—Why Trimming Tanks Are Used.—In the Mine Compartment.—And Last of All, the Sea Anchor.—Where the Crew of a Submarine Lives. |
| IV. | The Heart of the Submarine | 73 |
| What a Good Power Plant Is.—The Faults of the Steam Engine.—When the Gasoline Engine Came.—How the Gasoline Engine Works.—The Last Word in Submarine Engines.—Why an Electric Power Plant Is Needed.—The Dynamo-Motor and Storage Battery System. |
| V. | Making and Shooting the Torpedo | 91 |
| The First Submarine Torpedoes.—How to Make a Model Submarine Torpedo.—The Body of the Torpedo.—Your Torpedo in Action.—How a Real Torpedo Is Made.—The Detonating, or Firing Mechanism.—The Engine that Drives the Torpedo.—How a Torpedo Is Shot at a Ship.—A Torpedo with a Cannon in It. |
| VI. | Making the Submarine Deadlier | 115 |
| Arming the Submarine with Guns.—The Need of a Quick-Action Gun.—The Spring Action Gun.—The Compressed Air Action Gun.—How a Submarine Lays Mines.—Kinds of Submarine Mines.—How the Mines Are Made. |
| VII. | The Wonderful Eye of the Submarine | 129 |
| How the Eye of the Submarine Got Its Name.—The First Submarine Eye, or Periscope.—How to Make a Simple Periscope.—The Modern Lenticular Periscope.—How the Telescope Is Made.—The Latest Type of Periscope.—The Limited Use of the Periscope.—The New Enemy of the Submarine. |
| VIII. | The Marvelous Tongue and Ears of the Submarine | 143 |
| The Tongue and Ears of a Submarine.—Kinds of Signaling Systems.—The Wigwag Way of Signaling.—The Flashlight System.—The Wireless Telegraph System.—Underwater Signaling Systems.—The Electric Current, or Conductivity System. |
| IX. | The Crew of the Submarine | 159 |
| Conditions on Early Submarine Craft.—When Crews Were Hard to Sign.—What the Base-Ship Is For.—How Men Are Trained for Submarine Duty.—The Complement of a Submarine.—Breaking in Raw Recruits.—The Conditions in War Time. |
| X. | How the Submarine Attacks | 171 |
| The Uses of the Submarine.—The Submarine as a Scout.—The Submarine as a Blockader.—How a Submarine Attacks a Merchantman.—When Submarines Attack in Pairs. |
| XI. | The New Submarine Chasers | 185 |
| Schemes for Outwitting the Submarine.—Plans for Destroying the U-Boats.—Kinds of Submarine Chasers.—How the Chaser Chases a Submarine.—Shooting the Guns of the Chaser.—Submarine Air Chasers.—A Way to Lift the U-Boat Blockade. |
| XII. | The Last Word in Submarines | 199 |
| Uncle Sam’s Latest Submarines.—The Great Blockades of the Warring Nations.—The First of the Merchant Submarines.—Some Facts About the Deutschland.—How the United States Can Break the Blockade.—When Submarine |
