Submarine works with the fleet, how the, 173
Submarines, airplanes, a new enemy of, 139
Submarines, American inventors of, 7 cruising radius of Uncle Sam’s, 199 the first, 1
Submarines for the trans-Atlantic service, 206 types of, 16 your Uncle Sammy’s latest, 199 when they attack in pairs, 179
Submerge, definition of, 51 how the boat is kept, 65
Submersible boat, Lake, 16 what it is, 16
Telescope, how it is made, 132 how it is made and works, 133
Torpedo, air pressure required to drive, 101
Torpedo air tanks, 108 automobile, 92, 115 body of the, 100 body of a model, 92
Torpedo director, a, 100 engine that drives the, 104
Torpedo fired by a submarine, the first, 9 first submarine, 92 how it is aimed, 109 how to make a model submarine, 92 high powered explosive for the, 97 how a real one is made, 108 how it is shot at a ship, 107 is made, how a real, 97 making and shooting the, 91 motor for a model, 95
Torpedo practice, 167 propellers of a, 106
Torpedo, rudders of a model, 93 steering and diving rudders for a, 107
Torpedo, warhead of, 93, 97 weight of, 68
Torpedo tube, the, 108 submarine, first, 13
U-boat blockade, 200 a way to lift the, 195
U-boats, German, 185 plans for destroying the, 187
Van Drebel’s experiments on the Thames River, 6
Von Bernstorff, Ex-German Ambassador to the United States, 203
Zédé, Gustave, French submarine inventor, 16
[1] _Central Powers_: Germany, Austria, and Bulgaria.
[2] _Allies_: Governments united by a treaty or having common interests. England, France, Belgium, Russia, Italy, the United States, and Japan are called the _Allies_.
[3] _U-Boat_: So called because it is an undersea boat, or _Unterseeboote_, as the Germans call their submarines.
[4] _Paleozoic._—The next to the lowest geological series of strata.
[5] The _Pterodactyl_ was one of these and it was the largest living thing that ever flew. It is pronounced _Ter-o-dak´-til_.
[6] A _knot_ is the speed of a boat when she is making 1 _nautical_ mile in 1 hour. A nautical mile is 6,080 feet.
[7] The design, construction and operation of submarine torpedoes will be found in Chapter V.
[8] The storage battery was invented by Gaston Planté in 1860. The electric motor was discovered in 1876, by whom nobody knows.