High Frequency Apparatus Page xiii

CONTENTS Chapter XIII. HOT WIRE METER CONSTRUCTION Principle of the Hot Wire Meter. Ease and Cheapness of Construction. Measurement of Both Low and High Frequency Currents with One Instrument. How to Build a Simple Hot Wire Meter. Calibration and Use. xili 131 Chapter XIV. NOTES FOR THE BEGINNER IN ELECTRO-THERAPEUTICS Discussion of the Apparatus and the Principles upon which It Operates. Relation of Transformer to the Condenser and Oscillatory Circuit. The High Potential or Tesla Current. Physiological Effects of the High Frequency Current. Reduction of Blood Pressure. Treatment of Diseases of the Skin and Scalp. True Merit of the High Frequency Current in the Practice of Medicine. Stimulation of the Growth of Hair. Restoration of the Original Color to Grey Hair. Cumulative Effects. The Value of Persistent Administration. Practical Electro-Horticulture or the Cultivation of Plants with Electricity. Chapter XV. PLANT CULTURE WITH HIGH TENSION CURRENT Scarcity of Available Data. Investigation Mostly Private. Great Progress Made by Agricultural Departments of Schools and Colleges. The Art in the Experimental Stage. Electro-culture Methods. High Tension. Direct Current. High Tension, Low Frequency Alternating Current. High Frequency Alternating Current. Cultivation of a Bed of Lettuce. The Aerial Conductor. Caution Must Be Observed. Construction of the High Potential Transformer. Data for All Commercial Voltages and Frequencies. Assembly of the Apparatus. Actual Results Obtained. Report on Experiments at the Moraine Farm. Table of Comparative Results Obtained with Various Processes of ElectroCulture. 137 143