Chapter I

§ 1. Secondary Current by Induction. No FARADAY
Increased E. M. F.

2. Electric Spark and Increased E. M. F. PAGE
by Induced Current.

3. Spark in Secondary Increased by FIZEAU
Condenser in Primary.

4. Atmosphere around an Incandescent Live VINCINTINI
Wire.

5. Magnetizing Radiations from an Electric HENRY
Spark.

6. Arcing Metals at Low Voltage. FARADAY

7. Non-arcing Metals at High Voltage. WURTS
Practical Application.

8. Duration of Spark Measured. WHEATSTONE

8_a_. Discharge—Intermittent, Constant, and FEDDERSEN
Oscillatory—by Variation of
Resistance.

9. Musical Note by Discharge with Small FARADAY
Ball Electrodes. Invisible Discharge.

9_a_. Pitch of Sound Changed by Approach of FARADAY and
Conductor Connected to Earth. MAYER

10. Brush Discharge. Color. Striæ. Nitrogen FARADAY
Best Transmitter of a Spark, and its
Practical Bearing in Atmospheric
Lightning. Cathode Brushes in
Different Gases.

11. Glow by Discharge. Glow Changed to FARADAY
Spark. Motion of Air. Apparent
Continuous Discharge during Glow.

12. Spark. Solids Perforated. LULLIN

13. Spark. Glass Perforated. Holes Close FAGE
Together. Practical Application for
Porous Glass.

14 and Spark. Penetrating Power. Conducting KNOCHENHAURER,
14_a_. Power of Gas. Relation of E. M. F. to BOLTZMANN,
Pressure of Gases. Discharge through THOMSON
Hydrogen Vacuum Continued with Less (KELVIN),
Current than that Required to Start MAXWELL,
it. VARLEY,
HARRIS, and
MASSON

15. Dust Particles or Rust on the GORDON
Electrodes Hasten Discharge.

16. Where the Distance is Greater, the THOMSON
Dielectric Strength is Smaller, Both (KELVIN)
Distances Being Minute.

17. Discharge through Gases under Very High CAILLETET
Pressures. Increased Dielectric
Strength.

18. Discharges in Different Chemical Gases FARADAY
Variably Resisted.

19. Gas as a Conductor. Molecule for THOMSON, J. J.
Molecule, its Conductivity Greater
than that for Gases.

20. Relation of Light to Electricity. The BOLTZMANN,
Square Root of the Dielectric GIBSON,
Capacity Equal to the Refractive BARCLAY,
Index. HOPKINSON, and
GLADSTONE

21. Hermetically Sealed Discharge Tubes PLÜCKER and
with Platinum Leading-in Wires. GEISSLER

22. Luminosity of Discharge Tubes Produced GEISSLER
by Rubbing. Increased by Low
Temperature.

23. Different Vacua Needed for Luminosity ALVERGNIAT
by Friction and by Discharge.

24. Phenomena of Discharge around the Edges STEINMETZ
of an Insulating Sheet.

25. Highest Possible Vacuum Considered as a MORGAN
Non-conductor.

26. Constant Potential at the Terminals of DE LA RUE and
a Discharge Tube. MÜLLER

26_a_. Polarity of Discharge-tube Terminals in KLINGENBERG
Secondary of Ruhmkorff Coil.
Mathematical Deductions.

27. Pressure in Discharge Tube Produced by KINNERSLEY,
a Spark. HARRIS, and
RIESS

CHAPTER II.

28. Actions of Magnetism upon the Arc and DAVY,
Flame. BANCALARI, and
QUET

29. Rotation of Luminous Discharge by a DE LA RIVE
Magnet. Application in Explaining
Aurora Borealis.

30. Action of Magnet on the Cathode Light. PLÜCKER and
Relations Different according to the HITTORF
Position Relatively to the Magnetic
Lines of Force.

31. Discharge Retarded Across, and THOMSON, J. J.
Accelerated Along, the Lines of
Magnetic Force.

32. Resistance of Luminosity of the THOMSON, J. J.
Discharge Afforded by a Thin
Diaphragm.

33. Forcing Effect of the Striæ at a SOLOMONS
Perforated Diaphragm.

CHAPTER III.

34. Electric Images. RIESS

35. Electrographs on Photographic Plate by SANFORD and
Discharge. MCKAY

36. Positive and Negative Dust Pictures LICHTENBERG
upon Lines Drawn by Electrodes.

36_a_. Photo-electric Dust Figures. HAMMER

36_b_. Dust Portrait. HAMMER

37. Electrical Images by Discharge KARSTEN
Developed by Condensed Moisture.

37_a_. MAGNETOGRAPHS. MCKAY

38. Bas-relief Facsimiles by Electric PILTCHIKOFF
Discharge.

39. Distillation of Liquids by Discharge. GERNEZ

40. Striæ. Black Prints on Walls of Tube. DE LA RUE and
MÜLLER