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• Contents and Introduction
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• How Guglielmo Marconi Telegraphs Without Wires
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• Santos-Dumont and His Air-Ship
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• How a Fast Train Is Run
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• How Automobiles Work
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• The Fastest Steamboats
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• The Life-Savers and Their Apparatus
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• Moving Pictures—Some Strange Subjects and How They Were Taken
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• Bridge Builders and Some of Their Achievements
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• Submarines in War and Peace
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• Long-Distance Telephony—What Happens When You Talk into a Telephone Receiver
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• A Machine That Thinks—A Type-Setting Machine That Makes Mathematical Calculations
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• How Heat Produces Cold—Artificial Ice-Making
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