| The Drop Forge—Forging a Steel Plate | Frontispiece |
| FACING PAGE |
| Raising Water with a Chain of Pots—a Primitive Pump Used in Egypt | 32 |
| Horse-Operated Chain Pump Used in Greece | 32 |
| Multiple Spindle Drill in a Motor Car Factory | 33 |
| Bucket of a Giant Dredge with Its Jaws Wide Open | 64 |
| Gold Dredge Eating Its Way Through River Sands | 65 |
| Suction Dredge Excavating a Channel and Building New Land | 65 |
| Air Lock of a Pneumatic Caisson | 96 |
| Subaqueous Tunnel Showing the Shield in the Background | 97 |
| Wharf Protected by a Pneumatic Breakwater | 128 |
| Sun-Power Plant in Egypt | 129 |
| Close-Up of One of the Reflectors of a Sun-Power Plant | 129 |
| Giant Caproni Hydroaeroplane | 160 |
| Concrete Steamship “Faith” | 161 |
| “Virginian,” the Largest Locomotive in the World | 161 |
| Loom Provided with a Jacquard Attachment | 224 |
| Battery of Mule Spinning Frames | 225 |
| Jacquard Attachment for Loom | 225 |
| Digging a Trench with a Machine of the Chain Type | 256 |
| Multiple Plowing on a Western Wheat Field | 257 |
| Sawing Logs of Pulpwood into 16-Inch Lengths | 288 |
| Heater in a Pulp Mill Where the Wood Pulp Is Mixed with Clay | 288 |
| Modern Fourdrinier Paper-Making Machines | 289 |
| Molten Metal from a Blast Furnace | 320 |
| Bessemer Converter Blowing Air Through a Mass of Molten Iron | 320 |
| Steel Beam Passing Through the Finishing Rolls | 321 |
| Compositor at Work on a Linotype Machine | 352 |
| The Optophone, Which Enables the Blind to Read Print | 353 |
| Blind Man Reading with His Ears | 353 |
