| 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] |