| The double pivoted needle of Petrus Peregrinus | 17 |
| First pivoted compass, Peregrinus, 1269 | 19 |
| Magnetic Declination at New York | 21 |
| """San Francisco | 21 |
| ""in London, in 1580 and 1907 | 23 |
| First dip-circle, invented by Norman in 1576 | 29 |
| Norman's illustration of magnetic dip | 31 |
| Gilbert's orb of virtue, 1600 | 32 |
| Behavior of compass-needle on a terrella or spherical lodestone | 44 |
| Gilbert's "versorium" or electroscope | 69 |
| Gordon's electric chimes, 1745 | 75 |
| Modern form of Leyden jar, with movable coatings | 87 |
| Three coated panes in series | 89 |
| "panes in parallel | 89 |
| "jars in parallel | 90 |
| "jars in cascade | 90 |
| Discharge by alternate contacts | 94 |
| Tassel of long threads or light strips of paper | 101 |
| Procopius Divisch (1696-1765) | 108 |
| The Divisch lightning conductor (1754) | 111 |
| Set of pointed rods | 112 |
| Galvani (portrait) opposite page | 133 |
| Volta""" | 162 |
| Oersted""" | 205 |
| The Magnetic effect of an electric current | 209 |
| Magnetic field surrounding a conductor carrying a current | 212 |
| Magnetic whirl surrounding a wire through which a current is passing | 213 |
| AmpÈre's molecular currents | 214 |
| The "sympathetic telegraph" from Cabeo's Philosophia Magnetica, 1629 | 216 |
| The "sympathetic telegraph" from Turner's Ars Notoria, 1657 | 218 |
| AmpÈre (portrait) opposite page | 232 |
| Faraday""" | 299 |
| Clerk Maxwell (portrait) opposite page | 334 |
| Lord Kelvin""" | 361 |
