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"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" and the language of the book is English.


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  • Title: ➤  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
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  • Language: English

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  • Internet Archive ID: WirelessTelegraphyForAmateurs

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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 in Sound-waves. — Longitudinal Vibrations. — Transverse Vibrations. — Heat-waves. — Waves Shown by Diagrams. — Wave-length. — Amplitude. CHAPTER IV. Ether 32 Ether. — Early Investigators. CHAPTER V. Light and Light-waves 35 Light. — Light-waves. — The Human Eye. — Reflection of Light. — Refraction of Light. — The Visible Spectrum. — The Invisible Spectrum. — The Polarization of Light. CHAPTER VI. Action of Magnetism through Space 43 Exp. 8, To see what is meant by the magnetic field. — Directions. — The Magnetic Field. — Exp. 9, To study the action of magnetism through space. — Directions. — Discussion. — Exp. 10, To see whether magnetism can reach out through space and make another magnet at a distance. — Directions. — Magnet Produced by Induction. — Exp. 11, To study the inductive action of a magnet upon a piece of soft iron. — Directions. — Polarization. — Magnetism and Ether. — Ether-whirls. — Exp. 12, To illustrate how ether-whirls tend to shorten. — Directions. — Discussion. CHAPTER VII. Action of Static Electricity through Space 49 Exp. 13, To see whether static electricity can reach out through space and produce effects at a distance. — Directions. — Discussion. — Exp. 14, To see if static electricity can charge a body at a distance. — Directions. — The Electrophorus. — Exp. 15, To illustrate what is meant by an electric field. — Directions. — Electric Field. — Static Induction. — Electric Separation. CHAPTER VIII. Action of Current Electricity through Space 53 Exp. 16, To see what effect a current of electricity has upon a coil of wire. — Directions. — Electromagnetism. — Exp. 17, To see whether a current of electricity flowing in one coil can affect another coil of wire at a distance. — Directions. — Primary and Secondary Currents. — Induction Telegraphy. CHAPTER IX. The Induction-coil 57 Exp. 18, To study the effect of a piece of iron placed inside of a magnetized coil of wire. — Apparatus. — Directions. — Magnetic Permeability. — Transformation of Currents. — Direct Current through Transformers. — Induction-coils. — Exp. 19, To study the construction of a simple induction-corl. — Apparatus. — Directions. — The Secondary Currents. — Exp. 20, To study the action of a simple automatic "contact-breaker" or "current interrupter." — Apparatus. — Directions. — Automatic Interrupters. — Vibrating Interrupters. — Electrolytic Interrupters. — Miscellaneous Interrupters. — Exp. 21, To study the action of a simple condenser. — Apparatus. — Directions. — Condensation of .Electrification. — Exp. 22, To see what is meant by self-induction in coils of wire. — Apparatus. — Directions. — Self-induced or Extra Currents. — Condensers for Induction-coils. — Coil-connections. CHAPTER X. Electric-waves 70 Electric-waves and Radiant Energy. — Electric Sparks. — Heinrich Hertz. — Interference of Waves. — Stationary Waves. — Stationary Electric-waves. — Electric-waves and Light-waves. CHAPTER XI. Oscillating Currents 75 Pendulum Oscillations. — Actual and Potential Energy. — Oscillations in Matter. — Persistent Oscillations. — Damped Oscillations. — Oscillations shown by Diagrams. — Direct and Alternating Currents. — Electric Oscillations. — Frequency of Oscillations. — High- frequency Oscillations. CHAPTER XII. Electric Oscillators 81 Oscillators. — Oscillator System of Electrophorus. — Oscillator System of Condensers. — Hertz's Oscillator. — Lodge's Oscillators. — Disk Oscillator. — Oil Spark-gaps. — Ether waves from a Cat's Back. — Human Body an Oscillator-ball. CHAPTER XIII. Production of Electric-waves 85 Exp. 23, To study some of the methods of discharging an electrified body. — Apparatus. — Directions. — Convective Discharges. — Conductive Discharges. — Disruptive Discharges. — The Electrophorus. — Condensers. — Electric Machines. — Induction-coil Transmitters. — Transformers. CHAPTER XIV. Detection of Efectric-waves 92 The Human Eye. — Exp. 24, To study the resistance offered by metal filings to a current of electricity. — Apparatus. — Directions. — Resistance of Metal Filings. — Exp. 25, To study the effect of an electric spark upon the conductivity of metal filings. — Apparatus. — Directions. — Cohesion. — Coherers. — Detectors of Electric-waves. CHAPTER XV. Experiments with Coherers 97 Experiment 26, To study the action of a simple coherer. — Apparatus. — Directions. — Decohering. — Exp. 27, To test the effect of sparks upon various parts of the coherer circuit. — Directions. — Note. — Discussion. — Exp. 28, To study the effect of sparks upon an enlarged coherer circuit. — Apparatus. — Directions. — Wires as Carriers. — Exp. 29, To study the effect of placing an air-gap in the coherer circuit. — Action across Air-gap. — Exp. 30, To see whether the coherer circuit can be affected by a spark that is in no way connected with it. — Directions. — Wireless in Miniature. — Exp. 31, To see whether we can increase the distance at which a spark will affect the coherer. — Directions. — Exp. 32, To study the effects of very small sparks upon the coherer. — Directions. — Effects of small sparks. CHAPTER XVI. Experiments with Decoherers 103 Exp. 33, To study the effect of ringing an electric bell near the coherer circuit. — Apparatus. — Directions. — Sparking at Contact-points of Bell. — Exp. 34, To study the nature of the spark at the contact- points of an electric bell. — Apparatus. — Directions. — Shocks by Self-induced Current. — Exp. 35, To see how sparking at the contact-points of an electric bell can be avoided. — Apparatus. — Directions. — Liquid Spark-destroyer. — Exp. 36, To see how the coherer may be "tapped-back" by an electric bell. — Directions. — Electric Bell as a Decoherer. — Relay in Coherer Circuit. — How Relays Work. — Exp. 37, To see how a relay can operate an automatic decoherer. — Apparatus. — Directions. — Adjusting Coherers and Relays. CHAPTER XVII. Electric-wave Experiments 112 Apparatus for Studying Electric-waves. — Reflection of Electric-waves. — Refraction of Electric-waves. — Polarizatipn of Electric-waves. — Simple Electric-wave Experiments. — Exp 38, To show how apparatus may be shielded from electric-waves. — Apparatus. — Directions. — Metal Shields. — Exp. 39, To show how electric-waves may be reflected by simple apparatus. — Directions. CHAPTER XVIII. Home-made Coherers 118 Materials. — Conductor-plugs. — Glass Tubing. — Bases for Coherers. — Filings for Coherers. — Home-made Coherer No. 1. — Home-made Coherer No. 2. — Home-made Coherer No. 3. CHAPTER XIX. Home-made Auto-coherers 125 Auto-coherers. — Home-made Auto-coherer No. 1. — Home-made Auto-coherer No. 2. — Carbon-mercury-iron Auto-coherers. — Home-made Auto-coherer No. 3. — Adjusting Auto-coherers. — Home-made Oscillating Auto-coherer. — Aluminum Contacts. — Exp. 40, To see how resistance is offered by poor contacts in Auto-coherers. — Apparatus. — Directions. — Discussion. — Exp. 41, To see how electric-waves affect the resistance of an auto-coherer. — Apparatus. — Directions. — Electric-waves and Contacts. — Exp. 42, To see how the telephone receiver may be used in connection with an auto-coherer. — Apparatus. — Directions. — Discussion. CHAPTER XX. Anti-coherers and Other Detectors 137 Anti-coherers. — Magnetic Detectors. — Marconi Magnetic Detector. — Electrolytic Detectors. — De Forest Responder. — Fessenden Hot-wire Barretter. CHAPTER XXI. Miscellaneous Apparatus 141 Keys. — Telegraph Keys. — Other Keys. — Choking-coils. — Relays. — Polarized Relays. — Telephone Receivers. — Morse Registers. CHAPTER XXII. Home-made Accessories 147 Home-made Sparkless Key. — Home-made Oscillator No. 1. — Home-made Oscillator No. 2. — Home-made Condensors. CHAPTER XXIII. Induction-coil Experiments 154 Exp. 43, To show that the core magnetizes and demagnetizes by turning the primary current on and off. — Apparatus. — Directions. — Discussion. — Exp. 44, To see how the strength of the magnetism of the core may be varied. — Directions. — Current and Magnetism. — Exp. 45, To see how the spark may be varied. — Directions. — Discussion. — Exp. 46, To study the effect of different spark-balls upon the nature of the spark. — Directions. — Experiment 47, To find whether a large surface will hold more electrification than a small one. — Apparatus. — Directions. — Electrical Capacity. — Exp. 48, To find whether the capacity of a given conductor can be increased without increasing its size. — Apparatus. — Directions. — Condensers. CHAPTER XXIV. Aerials and Grounds 159 Antennae. — Aerials. — Grounds. CHAPTER XXV. Miscellaneous Aids 163 Telegraphic Codes. — Tripod Sending Station Support. — Box Sending Station Support. — Door Receiving Station Support. — Box Receiving Support. INDEX 169-171 Digitized by Google.

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