The speedy British "Whippet" tank that can travel at a speed of twelve miles per hour 120 The French high-speed "baby" tank 120 Section through our Mark VIII tank showing the layout of the interior 121 A Handley-Page bombing plane with one of its wings folded back 128 How an object dropped from the Woolworth Building would increase its speed in falling 129 Machine-gun mounted to fire over the blades of the propeller 136 Mechanism for firing between the blades of the propeller 136 It would take a hundred horses to supply the power for a small airplane 137 The flying-tank 144 An N-C (Navy-Curtiss) seaplane of the type that made the first flight across the Atlantic 145 A big German Zeppelin that was forced to come down on French soil 148 Observation car lowered from a Zeppelin sailing above the clouds 149 Giant British dirigible built along the lines of a Zeppelin 156 One of the engine cars or "power eggs" of a British dirigible 156 Crew of the C-5 (American coastal dirigible) starting for Newfoundland to make a transatlantic flight 157 The curious tail of a kite balloon 160 Observers in the basket of an observation balloon 160 Enormous range-finders mounted on a gun turret of an American warship 161 British anti-aircraft section getting the range of an enemy aviator 176 A British aviator making observations over the German lines 177 Radio headgear of an airman 192 Carrying on conversation by radio with an aviator miles away 192 Long distance radio apparatus at the Arlington (Va.) station 193 A giant gun concealed among trees behind the French lines 212 Observing the enemy from a papier-mâché replica of a dead horse 213 Camouflaged headquarters of the American 26th Division in France 220 A camouflaged ship in the Hudson River on Victory Day 221 Complex mass of wheels and dials inside a German submarine 240 Surrendered German submarines, showing the net cutters at the bow 241 Forward end of a U-boat 256