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