Cutting Up the Old Battleship _Maine_ 241 Cutting Away the Decks 241 An Oxy-Acetylene Gas Torch Weld 260 Tiny 200-Horsepower Turbine 261 The Tesla Turbine Pump 261 The Marvellous Tesla Turbine 280 Thomas A. Edison and His Concrete Furniture 281 Model of Edison Poured Concrete House 281 What One Set of Boys Did with Concrete 288 Massive Concrete Work 289 A Level Stretch of Catskill Aqueduct 289 Huge Concrete Moulds at Panama 304 Concrete Locks on the Panama Canal 305 The World-Wide Use of Concrete 308 The Catskill Aqueduct 309 The Aqueduct Deep Under Ground 309 The Silent Knight Motor 316 A Portable Army Wireless Outfit 317 The Wireless in the Navy 317 The Navy Wireless School 344 An Amateur Wireless Outfit 345 LIST OF DIAGRAMS A Simple Model Aeroplane 120 Diagram of the Earth 147 A Motion-picture Camera 177 A Motion-picture Printing Machine 184 Diagram of the Tesla Turbine 275 The Curtiss Turbine 285 Marconi Transmitter Layout 342 Marconi Detector Layout 344 The Pulmotor 372 THE BOY'S BOOK OF NEW INVENTIONS CHAPTER I THE AEROPLANE HOW A SCIENTIST WHO LIKED BOYS AND A BOY WHO LIKED SCIENCE FOLLOWED THE FASCINATING STORY OF THE INVENTION OF THE AEROPLANE. When, with engine throbbing, propellers whirling, and every wire vibrating, the first successful aeroplane shot forward into the teeth of a biting December gale and sailed steadily over the bleak North Carolina sand dunes for twelve seconds, the third great epoch in the age of invention finally was ushered in. First, man conquered the land with locomotive, electricity, steam plow, telegraph, telephone, wireless and a thousand other inventions. Almost at the same time he conquered the ocean with steamship, cable, and wireless. Now, through the invention of the aeroplane, he is making a universal highway of the air.