How Guglielmo Marconi telegraphs without wires Santos-Dumont and his air-ship How a fast train is run How automobiles work The fastest steamboats The life-savers and their apparatus Moving pictures: some strange subjects and how they were taken Bridge builders and some of their achievements Submarines in war and peace Long-distance telephony: what happens when you talk into a telephone receiver A machine that thinks: a type-setting machine that makes mathematical calculations How heat produces cold: artificial ice-making.

Public domain in the USA.

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