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CONTENTS.
PART I.
ELECTROSTATICS.
Description of Phenomena.
| Art. | Page | |
| 27. | Electrification by friction. Electrification is of two kinds, to which the names of Vitreous and Resinous, or Positive and Negative, have been given | 30 |
| 28. | Electrification by induction | 31 |
| 29. | Electrification by conduction. Conductors and insulators | 32 |
| 30. | In electrification by friction the quantity of the positive electrification is equal to that of the negative electrification | 33 |
| 31. | To charge a vessel with a quantity of electricity equal and opposite to that of an excited body | 33 |
| 32. | To discharge a conductor completely into a metallic vessel | 34 |
| 33. | Test of electrification by gold-leaf electroscope | 34 |
| 34. | Electrification, considered as a measurable quantity, may be called Electricity | 35 |
| 35. | Electricity may be treated as a physical quantity | 36 |
| 36. | Theory of Two fluids | 37 |
| 37. | Theory of One fluid | 39 |
| 38. | Measurement of the force between electrified bodies | 40 |
| 39. | Relation between this force and the quantities of electricity | 41 |
| 40. | Variation of the force with the distance | 42 |
| 41, 42. | Definition of the electrostatic unit of electricity.—Its dimensions | 42 |
| 43. | Proof of the law of electric force | 43 |
| 44. | Electric field | 44 |
| 45. | Electric potential | 45 |
| 46. | Equipotential surfaces. Example of their use in reasoning about electricity | 45 |
| 47. | Lines of force | 47 |
| 48. | Electric tension | 47 |
| 49. | Electromotive force | 47 |
| 50. | Capacity of a conductor | 48 |
| 51. | Properties of bodies.—Resistance | 48 |
