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.
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.
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.
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.
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.
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.
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
A Modern American Submarine Cruising in the Afloat Condition with Foreward Diving-Rudders Folded Back against the Hull _Frontispiece_