| Year | 1914 |
| Date | 30-Jul |
| Volume | 31 |
| Issue | 692 |
| Page | 103 |
| Category | Electronic |
| Part | |
| Title | Wireless Telegraphy. Its Present Position and Future Prospects |
| Author | J.A.Fleming |
| Notes | Lecture to the Royal Institution. Diagram of Professor Vanni's liquid microphone |