| CHAPTER I. |
| COIL CONSTRUCTION. |
| Construction of Ruhmkorff Coils. Sizes of Wires. Winding of Primary and Secondary. Assembling. Connecting Up. Insulation. Coils in Series. Oil Immersed Coils. "Tesla" Coil. Disruptive "Tesla" Coil. Coils for Gas Engines. Spark Coils. Resistance Coils. General Remarks on Coils. The Testing of a Coil for Polarity. Failure to Work. Medical Coils. Medical Coil with Tube Regulation. Medical Coil with Interchangeable Secondaries. Bath Coils | 1-64 |
| CHAPTER II. |
| CONTACT BREAKERS. |
| Construction of Contact Breakers. Various Forms of Simple Contact Breakers. The Mercury Vibrator. Polechanging Vibrator. Wehnelt Interrupter. Dessauer Contact Breaker. Steel Ribbon Interrupter. Contact Breakers in Vacuo. Queen Contact Breaker. Adjustable Contact Breaker for Medical Coils. The Queen Contact Breaker for Large Coils, Adjustable Cone Vibrator. Contacts | 65-91 |
| CHAPTER III. |
| INSULATIONS AND CEMENTS. |
| Selection of Insulating Materials. Mineral Oil. Paraffin Wax. Resin Oils. Beeswax. Shellac Varnishes. Silk. Insulating Compounds | 92-98 |
| CHAPTER IV. |
| CONDENSERS. |
| Construction of Condensers. Leyden Jar. Glass Plate Condenser. Paper Condensers. Series Condenser. Rolled-Up Condensers. Adjustable Condensers. Application of Condensers | 99-119 |
| CHAPTER V. |
| EXPERIMENTS. |
| Luminous Effects Obtained by Means of a Ruhmkorff Coil. Materials Used. Spark Experiments. The Luminous Pane. Luminous Designs, etc. | 120-130 |
| CHAPTER VI. |
| SPECTRUM ANALYSIS. |
| Color Produced by Burning Different Metals. The Spectroscope Shown in Connection with the Coil. The Screen. The Color Spaces in the Solar Spectrum. Color Values | 131-139 |
| CHAPTER VII. |
| CURRENTS IN VACUO. |
| Different Forms of Mercury Air Pumps. Geissler Tubes. Discharges in Vacuo. Characteristic Colors of Different Gases in Tubes, etc. | 140-152 |
| CHAPTER VIII. |
| ROTATING EFFECTS. |
| Effects of Discharges in Rotating Tubes. Construction of Rotating Wheels. Arrangement of Tubes, etc. | 153-163 |
| CHAPTER IX. |
| GAS LIGHTING. |
| The Application of the Ruhmkorff Coil for Lighting Gas. Gas Lighting in Series. Gas Lighting in Multiple. Gas Lighting Diagram. Jump Spark Burner. Automatic Burners | 164-177 |
| CHAPTER X. |
| BATTERIES FOR COILS. |
| The Selection of Suitable Batteries. Open Circuit Cells. Closed Circuit Cells. Description of Cells. FormulÆ for Solutions for Different Kinds of Batteries. The Grenet Battery. Fuller Battery. Gravity Battery. Dun Cell. Gethins Cell. Gordon Battery. New Standard. Edison-Lalande Cell. Dry Batteries. Dry Cell Construction, etc. | 178-199 |
| CHAPTER XI. |
| STORAGE OR SECONDARY CELL. |
| Construction of a Storage Cell. Connecting Up Cells. Charging Storage Batteries. Diagram for Charging from Dynamo Using a Rheostat. Diagram for Charging, using Lamp instead of Rheostat. Charging from. Primary Batteries. Testing Solutions. Setting Up the Storage Cell. The Harrison Cell. The "U. S." Storage Cell, etc. | 200-223 |
| CHAPTER XII. |
| TESLA AND HERTZ EFFECTS. |
| Currents of High Frequency. Electric Resonator. The "Tesla" Effects. Coil Connected to Discharger. High Frequency Currents in Electro-Therapeutics, etc. | 224-234 |
| CHAPTER XIII. |
| THE "ROENTGEN" RAYS AND RADIOGRAPHY. |
| General Arrangement of Connections for Coil and Crookes Tube for Making X Ray Negatives. The Fluoroscope. Phosphorus Tube. The Queen Self-Adjusting Crookes Tube. General Remarks, etc. | 235-247 |
| CHAPTER XIV. |
| WIRELESS TELEGRAPHY. |
| Arrangements of Simple Circuits of Coil and Coherer for Receiving and Sending Messages. The Coherer. Carbon Coherer. Coherer without Filings. Aluminum Coherer. Steel Ball Coherer. The Oscillator. Clarke's Oscillator. Triple Oscillator. The Coil. Translating Devices. Air Conductor, etc. | 248-265 |
| Index | 266 |
| Bibliography | 270 |
