Written while physics was changing rapidly, this book surveys measurement, states of matter, electrical conduction, cathode rays, radioactivity, and competing ideas about ether and matter. It captures the uncertainty scientists felt before relativity and quantum mechanics had fully reorganized the field.
Readers should treat discarded ether models as history, not current theory. The value is seeing discovery in motion: new instruments created results that old concepts could not comfortably explain.
About this free edition
This catalog record links to Project Gutenberg’s public-domain edition. Historical science books are valuable primary sources, but older claims should be compared with current evidence before being treated as modern scientific guidance.
