Preface; R.S. Cohen. Hertz, Helmholtz and Their Experimental Culture. Heinrich Hertz and the Berlin School of Physics; D. Hoffmann. From Helmholtz's Philosophy of Science to Hertz's Picture-Theory; M. Heidelberger. The Loss of World in the Image: Origin and Development of the Concept of Image in the Thought of Hermann von Helmholtz and Heinrich Hertz; G. Schiemann. Electrodynamics and the Discovery of Electromagnetic Waves. Heinrich Hertz's Experiments and Experimental Apparatus: His Discovery of Radio Waves and His Delineation of their Properties; J. Bryant. Hertz's Study of Propagation vs. Rutherford's Study of Structure: Two Modes of Experimentation and their Theoretical Underpinnings; G. Hon. On Hertz's Conceptual Conversion: From Wire Waves to Air Waves; M. Doncel. The Principles of Mechanics. Hertz's View on the Methods of Physics: Experiment and Theory Reconciled? S. D'Agostino. Hertz and the Geometrization of Mechanics; J. Lutzen. Hertz's Principles; S. Saunders. `Everything Could be Different': The Principles of Mechanics and the Limits of Physics; A. Nordmann. Hertz's Influence on Twentieth Century Science and Philosophy. The Reception of Heinrich Hertz's Principles of Mechanics by his Contemporaries; J. Mulligan. Heinrich Hertz's Mechanics: A Model for Werner Heisenberg's April 1925 Paper on the Anomalous Zeeman Effect; K. Hentschel. Heinrich Hertz's Picture-Conception of Theories: Its Elaboration by Hilbert, Weyl, and Ramsey; U. Majer. Hertz's Philosophy of Nature in Wittgenstein's Tractatus; G. Grasshoff. Afterword. Reflections and Reactions; J. Buchwald. Bibliography. Concordance and Index of Passages. Name Index.