Frontispiece, The Queen 45″ Spark Coil.
| FIG. | PAGE | |
| 1. | Section of Coil | 4 |
| 2. | Insulating Tube Ends | 10 |
| 3. | Sectional Winding | 11 |
| 4. | Section " First Method | 12 |
| 5. | "" Second Method | 13 |
| 6. | Proportional Diagram of Coil | 15 |
| 7. | Section Winder, End View | 17 |
| 8. | "" Face View | 17 |
| 9. | Assembly of Coils | 18 |
| 10. | Polechanging Switch | 31 |
| 11. | Disruptive Tesla Coil | 35 |
| 12. | Spark Coil for Gas Engine | 38 |
| 13. | Reproduction of a 32-inch Spark | 47 |
| 14. | Simple Medical Coil | 53 |
| 15. | Connections for Simple Medical Coil | 55 |
| 16. | Interchangeable Medical Coil | 56 |
| 17. | Vibrator for Medical Coil | 60 |
| 18. | Simple Contact Breaker | 65 |
| 19. | Imperfect Form of Contact Breaker | 67 |
| 20. | Superior Form of Contact Breaker | 67 |
| 21. | Spotteswoode Contact Breaker | 69 |
| 22. | Polechanging Contact Breaker | 74 |
| 23. | Wehnelt Interrupter | 78 |
| 24. | Ribbon Vibrator | 81 |
| 25. | Queen Contact Breaker | 82 |
| 26. | Adjustable Contact Breaker | 86 |
| 27. | Cone Contact Breaker | 88 |
| 28. | Coil Head Contact Breaker | 89 |
| 29. | Leyden Jar | 101 |
| 30. | Plate Condenser | 102 |
| 31. | Arrangement of Condenser Plates | 104 |
| 32. | Condenser Charging, First Method | 110 |
| 33. | Condenser Charging, Second Method | 112 |
| 34. | Adjustable Condenser | 118 |
| 35. | Spark between Balls | 125 |
| 36. | Short Spark between Balls | 125 |
| 37. | Sparkling Pane | 125 |
| 38. | Luminous Design | 128 |
| 39. | Electric Brush | 128 |
| 40. | Spectrum—Solar | 132 |
| 41. | Spectroscope and Coil | 133 |
| 42. | Simple Air Pump | 141 |
| 43. | Geissler Air Pump | 144 |
| 44. | Sprengel Air Pump | 144 |
| 45. | Solution Tube | 150 |
| 46. | Fluorescent Bulbs | 150 |
| 47. | Ruby Tube—Crookes | 150 |
| 48. | Iridio-platinum Tube—Crookes | 151 |
| 49. | Revolving Wheel | 154 |
| 50. | Tube Holder | 157 |
| 51. | Side View of Wheel | 157 |
| 52. | Geissler Tubes | 160 |
| 53. | Triangle on Disc | 161 |
| 54. | Maltese Cross on Disc | 161 |
| 55. | Gas Lighting Circuit | 165 |
| 56. | Connections for Gas Burners | 169 |
| 57. | Bartholdi Automatic Burner | 172 |
| 58. | Connections for Automatic Burner | 174 |
| 59. | The Grenet Cell | 180 |
| 60. | The Fuller Cell | 184 |
| 61. | The Gethins Cell | 193 |
| 62. | Lead Plate for Storage Cell | 201 |
| 63. | Wooden Separator | 201 |
| 64. | Charging with Rheostat | 207 |
| 65. | Charging with Lamps | 207 |
| 66. | Harrison Electrodes | 211 |
| 67. | Hydrometer | 221 |
| 68. | Hertz Resonator | 227 |
| 69. | Tesla Circuit | 229 |
| 70. | Tesla Cut Out | 231 |
| 71. | Tesla Cut Out, Top Plan | 232 |
| 72. | Circuit for X Ray Apparatus | 237 |
| 73. | Queen's Self-Regulating X Ray Tube | 240 |
| 74. | Transmitter for Wireless Telegraphy | 250 |
| 75. | Receiver for Wireless Telegraphy | 252 |
| 76. | The Branley Coherer | 254 |
| 77. | Clarke's Oscillator | 259 |
| 78. | Triple Oscillator | 259 |
| 79. | Air Wire Insulators | 263 |