CONTENTS.
CHAPTER I.
| [§ 1.] | Secondary Current by Induction. No Increased E. M. F. | Faraday |
| [2.] | Electric Spark and Increased E. M. F. by Induced Current. | Page |
| [3.] | Spark in Secondary Increased by Condenser in Primary. | Fizeau |
| [4.] | Atmosphere around an Incandescent Live Wire. | Vincintini |
| [5.] | Magnetizing Radiations from an Electric Spark. | Henry |
| [6.] | Arcing Metals at Low Voltage. | Faraday |
| [7.] | Non-arcing Metals at High Voltage. Practical Application. | Wurts |
| [8.] | Duration of Spark Measured. | Wheatstone |
| [8a.] | Discharge—Intermittent, Constant, and Oscillatory—by Variation of Resistance. | Feddersen |
| [9.] | Musical Note by Discharge with Small Ball Electrodes. Invisible Discharge. | Faraday |
| [9a]. | Pitch of Sound Changed by Approach of Conductor Connected to Earth. | Faraday and Mayer |
| [10.] | Brush Discharge. Color. Striæ. Nitrogen Best Transmitter of a Spark, and its Practical Bearing in Atmospheric Lightning. Cathode Brushes in Different Gases. | Faraday |
| [11.] | Glow by Discharge. Glow Changed to Spark. Motion of Air. Apparent Continuous Discharge during Glow. | Faraday |
| [12.] | Spark. Solids Perforated. | Lullin |
| [13.] | Spark. Glass Perforated. Holes Close Together. Practical Application for Porous Glass. | Fage |
| [14] and [14a.] | Spark. Penetrating Power. Conducting Power of Gas. Relation of E. M. F. to Pressure of Gases. Discharge through Hydrogen Vacuum Continued with Less Current than that Required to Start it. | Knochenhaurer, Boltzmann, Thomson (Kelvin), Maxwell, Varley, Harris, and Masson |
| [15.] | Dust Particles or Rust on the Electrodes Hasten Discharge. | Gordon |
| [16.] | Where the Distance is Greater, the Dielectric Strength is Smaller, Both Distances Being Minute. | Thomson (Kelvin) |
| [17.] | Discharge through Gases under Very High Pressures. Increased Dielectric Strength. | Cailletet |
| [18.] | Discharges in Different Chemical Gases Variably Resisted. | Faraday |
| [19.] | Gas as a Conductor. Molecule for Molecule, its Conductivity Greater than that for Gases. | Thomson, J. J. |
| [20.] | Relation of Light to Electricity. The Square Root of the Dielectric Capacity Equal to the Refractive Index. | Boltzmann, Gibson, Barclay, Hopkinson, and Gladstone |
| [21.] | Hermetically Sealed Discharge Tubes with Platinum Leading-in Wires. | Plücker and Geissler |
| [22.] | Luminosity of Discharge Tubes Produced by Rubbing. Increased by Low Temperature. | Geissler |
| [23.] | Different Vacua Needed for Luminosity by Friction and by Discharge. | Alvergniat |
| [24.] | Phenomena of Discharge around the Edges of an Insulating Sheet. | Steinmetz |
| [25.] | Highest Possible Vacuum Considered as a Non-conductor. | Morgan |
| [26.] | Constant Potential at the Terminals of a Discharge Tube. | De La Rue and Müller |
| [26a]. | Polarity of Discharge-tube Terminals in Secondary of Ruhmkorff Coil. Mathematical Deductions. | Klingenberg |
| [27.] | Pressure in Discharge Tube Produced by a Spark. | Kinnersley, Harris, and Riess |
CHAPTER II.
| [28.] | Actions of Magnetism upon the Arc and Flame. | Davy, Bancalari, and Quet |
| [29.] | Rotation of Luminous Discharge by a Magnet. Application in Explaining Aurora Borealis. | De La Rive |
| [30.] | Action of Magnet on the Cathode Light. Relations Different according to the Position Relatively to the Magnetic Lines of Force. | Plücker and Hittorf |
| [31.] | Discharge Retarded Across, and Accelerated Along, the Lines of Magnetic Force. | Thomson, J. J. |
| [32.] | Resistance of Luminosity of the Discharge Afforded by a Thin Diaphragm. | Thomson, J. J. |
| [33.] | Forcing Effect of the Striæ at a Perforated Diaphragm. | Solomons |
CHAPTER III.
| [34.] | Electric Images. | Riess |
| [35.] | Electrographs on Photographic Plate by Discharge. | Sanford and McKay |
| [36.] | Positive and Negative Dust Pictures upon Lines Drawn by Electrodes. | Lichtenberg |
| [36a.] | Photo-electric Dust Figures. | Hammer |
| [36b.] | Dust Portrait. | Hammer |
| [37.] | Electrical Images by Discharge Developed by Condensed Moisture. | Karsten |
| [37a.] | Magnetographs. | McKay |
| [38.] | Bas-relief Facsimiles by Electric Discharge. | Piltchikoff |
| [39.] | Distillation of Liquids by Discharge. | Gernez |
| [40.] | Striæ. Black Prints on Walls of Tube. | De La Rue and Müller |
CHAPTER IV.