High Frequency Apparatus Page xi

CONTENTS Experimental High Frequency Apparatus Chapter VII. INDUCTION COIL OUTFITS OPERATED ON BATTERY CURRENT Simple Ideal Apparatus for the Experimenter. Oudin Resonator for Use with a Wireless Transmitter. Interesting Results Obtained with Mediocre Apparatus. Operation of the Outfit. How to Tune the Oscillatory Circuits. Induction Coil Construction. How to Build a Coil Giving a Thick, Hot Spark. Core and Primary. Insulation. Secondary Winding. Simple Winding Apparatus. Assembly. Interrupter and Use of Silver Contacts in Lieu of Platinum. sion or Secondary Condenser. Chapter VIII. KICKING COIL APPARATUS Condenser. High TenPossibilities of this Type of Apparatus. Use on Either Direct or Alternating Current Circuit. What the Kicking Coil Is. Design for Portable Outfit Giving Seven Inch Spark. Construction of the Interrupter. The Choke Coil. Data for Cores and Windings. The Condenser. Use of Lantern Slide Cover Glasses. The Oscillation Transformer. How the Pancake Coil is Wound. Variable Primary for Tuning. Assembly of the Apparatus. Testing and Using. Electro-therapeutic Work. Construction of D'Arsonval Attachment. Chapter IX. ONE-HALF KILOWATT TRANSFORMER OUTFIT Advantages of a Transformer for Use on Alternating Current Circuit. Design for a One-Half Kilowatt Magnetic Leakage Transformer. Construction of the Core. Primary Winding. Data for All Commercial Voltages and Frequencies. Secondary Winding. Assembling and Mounting. Oudin and Tesla Coils to Give Eighteen Inch Spark. Construction of the Coils. Condenser and Spark Gap. Connecting and Using. Protection from "Kick Back" on the Line. xi 56 71 85