This nonfiction volume presents Sir David L. Salomons’s hands‑on investigations into how vacuum tubes behave in rarefied gases and in magnetic fields. Accessible overviews sit alongside detailed descriptions of experimental setups, apparatus, and the methods that helped shape early electrical science. The book emphasizes observation and method over theory, inviting readers to follow the author’s step‑by‑step explorations and to appreciate the craft behind pioneering measurements.

Clear explanations of how vacuum tubes are used to study electric phenomena and magnetic fields
Descriptions of experimental apparatus and practical testing techniques
Illustrated discussions of phenomena such as band formation, discharge patterns, and tube behavior in different setups
Context on historical experiments and the evolution of tube technology

Ideal for readers with an interest in the history of electrical engineering, experimental physics, and the practical side of tube technology.

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