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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

  by St. John, Thomas M.
  

  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.

  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.

  THEORY AND PRACTICE 11

  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.

  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.

  First published in 1906
  2 editions, 1 ebook

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