| Year | 1906 |
| Date | 13-Sep |
| Volume | 15 |
| Issue | 281 |
| Page | 258 |
| Category | Electronic |
| Part | |
| Title | How to Make a Small Wireless Telegraph Installation |
| Author | "Electrus" |
| Notes | Ruhmkorff coil & telegraph key, transmitter & connections, adjusting coherer, connections for receiving apparatus |