| PAGE |
| THE STORY OF THE SUBMARINE | 9 |
| Origin of Submarine Navigation, 9. The American Types, 10. Twentieth Century Submarines, 11. Engine Power, 12. The Periscope, 13. Voyage of the “Deutschland,” 14. Submarine Dredging, 15. |
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| THE STORY OF THE PANAMA CANAL | 17 |
| The United States to the Rescue, 17. The Canal and the Navy, 20. The Great Canal, 20. The Hydroelectric Station, 20. Gigantic Obstacles, 30. Gatun Dam, 33. Meeting all Emergencies, 33. A Battle Won, 36. |
| What is a Geyser? 40. What Kind of Dogs are Prairie-Dogs? 42. What is Spontaneous Combustion? 42. |
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| THE STORY IN THE TALKING MACHINE | 43 |
| The Early Machines, 43. Invention of the Spring Motor, 47. Change from Cylinder to Disc, 47. Making the Record, 49. |
| What are Petrified Forests? 49. What Animals are the Best Architects? 51. |
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| THE STORY OF THE MOTORCYCLE | 52 |
| Austin’s Steam Velocipede, 52. Motor-paced Racing, 55. First Practical Machine, 54. Modern Refinements, 57. Side Cars and Commercial Bodies, 58. |
| How is the Weather Man Able to Predict Tomorrow’s Weather? 58. How does a Siren Fog Horn Blow? 60. |
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| THE STORY IN A WATCH | 61 |
| The Standard of Time, 61. Candles as Time-Keepers, 63. Galileo’s Pendulum, 63. Balance Wheel as a Pendulum, 65. The Time Train, 65. How a Watch Works, 67. What Causes Variation in Watches, 71. |
| How does a Monorail Gyroscope Railway Operate? 72. Why are Finger-prints used for Identification? 74. |
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| THE STORY IN A RIFLE | 75 |
| The Earliest Hunters, 75. The Use of Slings, 77. A Fortunate Accident; 77. As to Arrows, 81. A Shooting Machine, 81. And Now for Chemistry, 81. Playing with Fire, 83. The Coming of the Matchlock, 83. Caps and Breech-Loaders, 85. From Henry VIII to Cartridges, |
| STORY OF THE WIRELESS TELEGRAPH | 263 |
| Stretching a Dog, 263. Marconi’s Method, 263. Tuning the Instruments, 264. Interferences, 265. |
| What is Forestry Work? 267. How did the Fashion of Wearing Cravats Commence? 270. How does the Gas Meter Measure Your Gas? 270. What is a Game Preserve? 270. |
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| THE STORY OF THE BUILDING OF A SILO | 271 |
| What is a Silo? 271. The First Silo, 271. What is put in a Silo? 271. Elements of Success or Failure, 271. |
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| THE STORY OF THE ADVANCE OF ELECTRICITY | 273 |
| The First Commercial Central Station, 273. Edison and the Electric Light, 273. Electricity a Living Factor, 279. In the Printing Trade, 279. Construction, 279. Loft Manufacturing, 281. Electric Heating, 281. Electricity and Safety, 281. Electricity in Medicine, 281. Electric Vehicles, 282. Electricity and the Home, 282. Decreased Cost of Electricity, 285. |
| How is Die-Sinking Done? 285. |
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| THE STORY IN THE MAKING OF A MAGAZINE | 286 |
| Printing in Millions, 286. Color Printing, 289. |
| How Did the Ringing of Curfew Originate? 289. |
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| THE STORY OF AMERICA’S FIRST HORSELESS CARRIAGE | 290 |
| The Problems of Weight and Vibration, 290. The First Demonstration, 290. |
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| THE STORY IN A SAUSAGE | 292 |
| The First “Roast Pig,” 292. Smoking Ham, 292. Salt Pork, 293. The Era of Refrigeration, 295. An Up-to-date Packing Plant, 295. Dressing Meat, 298. By-Products, 298. |
| Why do We call them “Dog Days?” 301. How is a Five Dollar Gold Piece Made? 303. How does a Bird Fly? 303. |
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| THE STORY OF THE BIG REDWOOD TREES | 304 |
| Long Life of the Great Trees, 304. Valuable Qualities of the Redwood, 304. Fire Retardance, 306.Magnificent Tones for Decoration, 306. |
| How did the Expression “Forlorn Hope” Originate? 306. Why is “Wall Street” known Around the World? 468. An Unknown Leviathan, 470. |
| What is an Armored Railway Car Like? 470. What is an Electric Eel? 472. |
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| THE STORY OF SALT | 473 |
| Natural Salt, 473. The Polish Mines, 474. Refining, 476. |
| Why do We Call it “Denatured Alcohol”? 478. What is the Difference between a Cruiser and a Battleship? 478. |
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| THE STORY OF THE GROWTH OF THE MOTOR TRUCK | 481 |
| Practically Developed since 1905, 481. Cheaper Transportation, 489. |
| What is a Diving Bell? 489. How are Harbors Dredged Out? 491. How is a Razor Blade Made? 491. |
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| THE STORY OF THE TUNNELS UNDER THE HUDSON RIVER | 492 |
| Bold Engineering, 492. 40,000 Men, 492. How the Tunneling Shield Works, 494. Air Pressure, 496. Extraordinary Adventures under the River, 501. |
| What Causes Floating Islands? 504. |
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| PICTORIAL STORY OF THE AIRSHIP | 505 |
| Well-known Aviators, 505. Military Monoplane, 506. NC-4, First Plane to Cross the Atlantic, 507. Vickers-Vimy, First Flier to make Non-Stop Atlantic Flight, 508. Chart of Transatlantic Fliers, 509. The Wright Brothers, 510. British Transatlantic Dirigible, R-34, 511. Examples of Military Uses, 512. |
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| THE STORY OF AN AUTOMOBILE FACTORY | 518 |
| A half-million Cars a year, 518. Overhead Cranes Cut Costs, 520. Safety First, 521. One thingat a Time, 524. Quick Assembling, 526. The Body Chute, 530. Motion Picture Advertising, 537. |
| How do Big Buildings get their Granite? 539. |
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| RAILROAD SCENES FROM SHOP AND ROAD | 541 |
| All Steel Train, 541. Electric Train, 542. Train of 120 Cars, 543. An Observation Car, 544. Electric Baggage Truck, 545. Terminal Stations, 546. Paint Drying Oven, 547. Locomotive Building, 548. Types of Locomotives, 550. |
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| THE STORY OF AN UP-TO-DATE FARM | 556 |
| Luxuries of Farm Life,
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