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CONTENTS. Chapter I. THE ALTERNATING CURRENT AT LOW AND HIGH FREQUENCIES Introduction. What the Alternating Current Is. Change of Frequency. Effects of Change in Frequency. The High Frequency Current. Characteristics of the High Frequency Current. Spectacular Demonstrations. The High Frequency Current in Medicine. Generation of Ozone and the X-Ray. Electrical Cultivation of Plants. Radio Telegraphy and Telephony. Chapter II. HOW THE HIGH FREQUENCY CURRENT IS PRODUCED Three Practical Methods. The High Frequency Alternator. Advantages and Disadvantages. The Direct Current Arc Generator. Condenser Discharge Generator. Principles Involved. The Kicking Coil Method. Limitations and Unique Advantages. 12 Some Points in the Construction of High Frequency Apparatus Chapter III. THE HIGH POTENTIAL TRANSFORMER OR INDUCTION COIL TransPrinciple of the Commercial Transformer. formers for Condenser Charging. How Arcing is Prevented. Development of the Eastham Magnetic Leakage Transformer. The Question of Proper Secondary Potentials. Advantages of Relatively High and Low Voltage. Transformer Construction. Transformer Designing. How to Calculate Number of Turns, Size of Core, etc. Core Volume. Changes Necessary for Use on Various Frequencies. Proportions of Core. Induction Coils for High Frequency Work. How they Differ in Design and Proportion. Induction Coil Design. Kicking Coils. What they Are. ix 16