English

Wireless telegraphy for amateurs and students; containing theoretical and practical information, together with complete directions for performing numerous experiments on wireless telegraphy with simple home-made apparatus

TABLE OF CONTENTS THEORY AND PRACTICE 11 CHAPTER I. Early Methods of Wireless Telegraphy 13 Various Methods. — Voice Wireless. — Sign Wireless. — Dinner-bell Wireless. — Signaling with Light. CHAPTER II. Waves in Solids, Liquids and Gases 16 Water-waves. — Ripples. — Regular Water-waves. — Interference. — Exp. 1, To show small irregular water-waves or ripples. — Directions. — Exp. 2, To study concentric-waves. — Directions. — Signals over Water. — Wave Detector for Water-waves. — Exp. 3, To study water-waves by means of a detector. — Air-waves. — Directions. — Exp. 4, To show how disturbances in the air can produce effects at a distance. — Directions. — Discussion. — Sound-waves. — Sound. — Exp. 5, To see whether sound-waves can travel in liquids. — Directions. — Sound through Liquids. — Exp. 6, To see whether sound-waves are transmitted by solid bodies. — Directions. — Sounds through Solids. CHAPTER III. Wave-motion 26 Ordinary Matter. — Molecular Vibrations. — Exp. 7, To see how energy can be transmitted through the particles of a body. — Directions. — Transmission of Energy through Molecules. — Molecules and Waves. — Motion of Molecules in Water-waves. — Motion of Air Particles

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